I just ran across some very high quality 1920x1200resolution Half Life 2: Lost Coast screenshots at
http://www.will-burn.net/?p=75 and wow, they're impressive! I figure there's someone on this board that'll enjoy them so have fun
I know some people don't like clicking links but I don't like huge screenshots flooding this thread.
Here's a link to the directorys that the images are in just in case it falls off the front page of the blog they're posted on.
http://www.will-burn.net/blogimages/lostcoast/oldman
http://www.will-burn.net/blogimages/lostcoast/scenery
http://www.will-burn.net/blogimages/lostcoast/chapel
http://www.will-burn.net/blogimages/lostcoast/combine
The blog also has some high quality/high rez screenshots of Day of Defeat: Source which are also pretty impressive.