So, anyone tried if games bought from GOG work under Linux with little trickery using Wine/PlayOnLinux? Has there been any word if any of the games will be ported to Linux (maybe on some of the most popular distros, at least)? I know it would be rather large job, but would be really cool. Anyways, thanks for the great service and happy holidays!

http://www.gog.com/en/forum/general/gog_games_that_runs_on_linux

I highly doubt gog would ever port games to linux, but that would be awesome if they did.

Here you go:
gog games that are working fine with linux wine
gog games hat runs on linux
GOGMix

1) No, GOG will never formally support Linux. Too many lost source codes to bother with, never mind the time and effort required for native Linux versions for everything for proportionally little gain or any potential licensing problems.
2) If you can run the .exe (presumably using Wine), any ScummVM games should run natively with the Linux version of ScummVM (ditto Macs, ditto any other format ScummVM supports). Dunno about the status of DOSbox, but I'll be very surprised if there isn't a Linux fork of it.
3) There may be other games than run under Wine, but your mileage may vary. Ask around, I think there's a list on the forums or a GOGmix that should do the job. (Edit: Damn ninjas)

If you're looking native linux ports of windows games you probably should look at [url=]Linux Game Publishing (LGP)[/url] instead (Currently down due to multiple hardware failures on their server). Expect to pay new retail or near new retail prices for any game they port though. While waiting for server to get back up you can check Wikipedia for information about games they've ported so far.

There certainly is. I use it to play Cannon Fodder and Master of Magic mainly.

For DOSbox games, I use innoup to get the files and then run it from the command line. For example:
dosbox -conf master_of_magic.conf

Currently working on a setup where I put the game files in /usr/local/games and then have a script create a unionfs mount to run the game from (eg. /usr/local/games/masterofmagic as the RO base and then $HOME/.masterofmagic as the RW directory).