Half-Life 2: Short Stories is a mod for Half-Life 2 focused on showing some different sides of the Half-Life Universe. Currently we're looking to recruit a few character modelers and level designers for our first episode, which will be released sometime in 2008.
The characters needed already have concepts, and we're currently getting them all model sheeted as well. The possibility to even decompile and edit some of the original models would make some of this quick as well. As for level design, we've gotten most of the gameplay and scenarios down, as well as having a variety of concepts for things. Should be a lot of fun. 
If you're interested or know anyone else who is, please don't hesitate to send them our way.