Favorite Comic Book/Graphic Novel cover

For me it is John Buscema's Silver Surfer #4... Other's would be Iron Man #1,
Captain America #113 (Steranko), Cap America Annual #8 (Zeck), and House of Secrets #92 (Wrightson).... just to name a very few.... The rest is up to you!

Pick up a copy of Wizard #127 (April 2002) For a pretty decent and debatable list of the "Top 100 Covers of all Time"...

I going to stick to old school
Pound for pound, I think Neal Adams did some of the most memorable comic covers of all time. Here is a very personal, and non representative stash of some favorites:

Strange Adventures #218
http://www.comicbookdb.com/graphics/comic_graphics/1/98/52946_20060722203230_lar...

Lois Lane #81
http://www.comicbookdb.com/graphics/comic_graphics/1/35/22020_20051230160459_lar...

Adventure Comics #365

http://www.comicbookdb.com/graphics/comic_graphics/1/92/49824_20060709003128_lar...

Adventure Comics #378

http://www.comicbookdb.com/graphics/comic_graphics/1/92/49837_20060709005330_lar...

Superboy #160

http://www.comicbookdb.com/graphics/comic_graphics/1/100/53967_20060727001000_la...

Batman #221

http://www.comicbookdb.com/graphics/comic_graphics/1/143/68632_20061120145823_la...

And this is the most obvious pick I've made so far Batman #251

http://www.comicbookdb.com/graphics/comic_graphics/1/95/37176_20060714214950_lar...

Jimmy Olsen #115

http://www.comicbookdb.com/graphics/comic_graphics/1/165/52872_20070130222813_la...

Jimmy Olsen #135

http://www.comicbookdb.com/graphics/comic_graphics/1/31/20101_20051221210536_lar...

And here's some other stuff that still sticks in my mind :

Nick Fury Agent of Shield #7

http://www.comicbookdb.com/graphics/comic_graphics/1/83/44878_20060611134329_lar...

Nick Fury Agent of Shield #6

http://www.comicbookdb.com/graphics/comic_graphics/1/86/44877_20060619134859_lar...

Captain Marvel #36

http://www.comicbookdb.com/graphics/comic_graphics/1/60/27261_20060413182536_lar...

Weird Science #15

http://www.comicbookdb.com/graphics/comic_graphics/1/220/107671_20071029132956_l...

Weird Science #17

http://costa.lunarpages.com/ec/ws17.jpg

Weird Science #20

http://www.comicbookdb.com/graphics/comic_graphics/1/220/107674_20071029133325_l...

Zap #0

http://www.deniskitchen.com/Merchant2/graphics/00000001/C_ZAP.0.B.JPG

Zap #8

http://www.coverbrowser.com/image/zap/8-1.jpg

Amen to your list arthurfayn!

I'm not sure if I have a favorite and in any case it would change all the time as I revisit the covers. I'm very partial to covers showing lots of action rather than a pose (but it's hard to get away from those too as some are very good). The most memorable covers for me are those by my favorite artists growing up - Smith, Wood, Wrightson, Adams, etc. I've since discovered many Golden Age books that I think are quite beautiful like those done by Raboy and Kirby (for opposite reasons really).

Here are just a few covers that made a particularly big impression on me when I first saw them (I still remember where I was when I saw a couple of these).
Now that I look at them...it seems I had a thing for covers with big full-figure drawings of superheroes.

Green Lantern Green Arrow #87

http://www.comicbookdb.com/graphics/comic_graphics/1/77/38057_20060523185705_lar...

Warlock #9

http://www.comicbookdb.com/graphics/comic_graphics/1/16/11381_20051122124321_lar...

X-Men #58 (bad scan)

http://www.comicbookdb.com/graphics/comic_graphics/1/15/3054_20051121102959_larg...

Micronauts #12

http://www.comicbookdb.com/graphics/comic_graphics/1/15/11148_20051121173004_lar...

New Mutants #22

http://www.comicbookdb.com/graphics/comic_graphics/1/107/4597_20060815130050_lar...

DC Specials Series #2 The Original Swamp Thing Saga

http://www.comicbookdb.com/graphics/comic_graphics/1/103/55941_20060804184535_la...

An Otomo cover for Action Comics (not the American one)

http://www.geocities.com/Tokyo/Ginza/8126/otomoeast.jpg

And Nick Fury, Agent of Sheild #6 (already mentioned)

I forgot about that Havok cover-that's a good one!

Some of these were the first time I'd ever seen the artist's work.
The Swamp Think reprint cover was the first Wrightson art I ever saw and Micronauts 12 was the first time I became aware of Michael Golden (though I must not have been paying attention, because I already had Micronauts #1 which, since it was inked by Rubenstein, probably had better interior art.)

I always liked Wrightson's interiors on the Swamp Thing books better than the covers (except for maybe #9 and #10), but here's a cover by Nestor Redondo on issue #12 that I think is enormous:

http://www.fortress-of-solitude.com/albums/wants/Swamp_Thing_12.jpg

Actually got some more-how about these Kevin Nowlan beauties:

Strange Tales #6

http://www.comicbookdb.com/graphics/comic_graphics/1/6/4705_20051013002737_large...

Strange Tales #7

http://www.comicbookdb.com/graphics/comic_graphics/1/6/4706_20051013002824_large...

Strange Tales #11

http://www.comicbookdb.com/graphics/comic_graphics/1/141/5418_20061116050330_lar...

Strange Tales #16

http://www.comicbookdb.com/graphics/comic_graphics/1/6/5652_20051021221315_large...

Strange Tales #18

http://www.comicbookdb.com/graphics/comic_graphics/1/6/5655_20051021221457_large...

Actually when you start with Nowlan, where do you stop? But these are some of the first I saw that pulled my eyeballs out...

I agree about Nowlan...I was going to add this one...but then I kept finding more and more...and there was no way to choose

http://www.coverbrowser.com/image/alpha-flight/52-1.jpg

That is truly a great cover! Redondo was one of the best! Almost reminds me of Williamson