Hi!
Me and a friend of mine recently finished a mod for HL2 EP2 called "Mission Improbable".
It has 4 new levels, tons of new art content, a new character and around 2 hours of gameplay.
Here are some screenshots:
http://media.moddb.com/images/mods/1/16/15475/release_mimp2.jpg
http://media.moddb.com/images/mods/1/16/15475/release_mimp3a.jpg
http://media.moddb.com/images/mods/1/16/15475/mimp2_carview.jpg
If you want to give it a go, or just see more screenshots, then you can do so here:
http://www.moddb.com/mods/mission-improbable
I hope you decide to play it, we worked very hard on it