What are the chances of X-Com Series coming to gog??? I hope they will for sure.
This is a great deal though and I do not like Steam. Five games for $5.00 is quite nice for sure, but I still rather see them here on gog.

What about the compatibility of the steam versions to Win XP?
Did they make them run on modern systems, or do I have to fiddle with dosbox myself?

Anything bought through Steam should run through Steam.

Another happy PS3 mouse/keyboard user here (you don't even need an adapter, the PS3 has a surprisingly wide support for standard devices like hubs, card readers, printers, usb headsets/microphones, mouse, keyboard, standard gamepads, steering wheels and a lot more that I just can't remember right now). The PS3 is just the more comfortable alternative for the tasks it was meant for, like chats, messaging, voip, video conferencing and the like (and of course games and multimedia, but that goes without saying). It can't do everything and so cannot replace your PC, but what it does, it does well. I don't think I've watched a single movie on my PC ever since I got my PS3. Why? Because it's so darn easy to do on my PS3. No messing with codec priorities, speaker configuration, stuttering when the resolution is too high, vertical sync issues unless you use a special D3D fullscreen mode and so on. It just works.

it runs through dosbox, on steam.

Just bought it.
Thanks.

Purchased the whole X-com bundle a few months ago, but I've only booted up UFO Defense a whole two times. It's not a very newbie friendly game. I still have no idea what I'm suppose to do in that game.

It runs flawlessly in DOSbox 0.72, which uses pretty standard rendering methods. I'd be surprised if none of the five options worked for you.
Read the manual. :P Alternatively, you can watch the "playing X-COM while drunk off your ass" videos that this guy made, that should give you an idea of how to start.

Look over the manual and here are a few simple tips.
1. Know what each button does.
2. Try not to exhaust your units points.
3. Play it safe to keep them alive by not being out in the open that often.
4. Move in groups.
5. Remember one Ship is for shooting down the UFO and then the other is to send a team to check out the crash site.
6. By enough weapons and ammo to keep the men alive.
7. build your base and do Research and other things to better your base and units.
8. Keep the time at 5 sec. until you are all set and then save. Then change time to 1 hour to find a UFO and then follow the above advice.
9. Oh, remember to use the Ladder Up, Ladder Down Icons to see various levels and move correctly. I believe that is the icon anyway.
These are little things but they should help.
I hope this helps as once you get it, it can be a great game that really puts you up against it at times.

More interestingly their defination of Europe seems to vary time to time.
I live in Turkey, When they launched EA titles over Europe They were available to me. But for some reason X-Com games are not. (Not that I would buy it over Steam anyway)

I got a tip. Always save points for interrupt. Or wait, does X-com have interrupt or am I confusing it with UFO: Alien Invasion?

yeah its got it. I never turn off the save points for a snap shot movement option unless I know I'm in a safe zone, that way they can take a shot at anything that comes into range.

It's nice to see another Turkish person in here. :)

X-com: Enemy Unknown is my favorite strategy game, and I don't normally like these type of games.
Just so you know, Steam isn't required to run the game, so no DRM (but don't tell Valve that!)

All of the DOSBOX-based games on Steam are like that. I don't think they really care.