I just downloaded the icEnhancer 2.0 mod for GTA4 after watching some of the videos showing how this mod transforms GTA4. The difference is absolutely amazing! It looks like real life video:
I got it from here, but his website is here. I also discovered there's a boatload of GTA4 mods at gta4-mods.com, so I'll be checking those out when I have time
I downloaded it, two folders, lots of options - confusing! Not really sure what you supposed to do to install.
And apart from that, Saints Row The Third really knocks GTAIV into a cocked hat, have been playing that a lot lately, not really interested in GTAIV anymore tbh.
GTA4 still light years ahead of Saints Row when it comes to driving characteristics and physics IMO I found out that if you have the Steam version of GTA4, as I do, there's a few prerequisites to make it more like the non-Steam version (required to use most GTA4 mods):
GTAIV may be superior to Saints Row Third in terms of physics but it sure as hell ain't as much fun
In fact, compared, it's considerably dull, mebbe I'm just a big kid.
I bought GTAIV shortly after it came out, a supermarket named Morrisons were selling it for a tenner when it cost 30 everywhere else, I actually drove to Peckham to get the cheap copy, so mine it no Steam.