Last week, Adriaan briefly mentioned that we added a new GTA IV screenshot gallery, with all the latest high-quality screens. Along with this, we have setup an artwork gallery containing all of the GTA 4 artwork and logos, and also a characters page, detailing the characters we know about so far.
These pages will be constantly updated as soon as new information arrives, so be sure to keep an eye on them and feel free to leave feedback or suggestions at our forums.