I realize this is the HR thread, but I'd really like to play the first game. Does anyone know of some mods to max out the first game's graphics?
Thanks.

http://www.moddb.com/mods/deus-ex-new-vision. It improves pretty much all world textures.
It also comes with the latest version of the DirectX10 renderer someone made, which makes the graphics a bit better too.
There's also HDTP which is going to replace objects and NPCs, but it's not finished yet. ETA is 'coming soon'. That has been the ETA for the last 3 years or so. But apparently there is still something going on there. So hopefully some time in 2012.
There's a http://www.moddb.com/mods/project-hdtp/downloads/hdtp-release-1. It doesn't replace a whole lot, but some of the objects it does replace are very common (supply crates) so it's worth installing.