once, i was thinking to buy x box 360, but then i reallized tha i had to buy new television too. i think that xbox360 is no worth without a high definition telly... so i rejected this idea and started playing WoW

I played my Xbox 360 for a year and a half before finally upgrading to HD, and I must say while better, 360 games, unlike shit PS3 ones, do not rely upon graphics to be amazing games. Gameplay, Story, and stellar Online experience drive most of there games, not graphics.

So in short, buying an HD TV improves the experience, but I can safely say that the games don't need HD to be heavily enjoyable.

I don't have an HDTV anywhere in my house, and I enjoy my 360 just fine.

Yeah it doesn't really make much of a difference. The graphics won't look as great as on a HDTV of course, but the graphics won't be crap either. They will look better than the PS2 for the most part (well depending on the game of course).