Having workied on process docs and control, asset control for a game and a testing environment the best way to deal with it is ticks version...

Modelname_date_ver

This can enhanced for assets that could repeat:

modelName_areaused_date_ver

i.e. :

hotel_minatorOutpost_02052006_1.5.mb
hotel_humanOutpost_12042006_2.2.2.mb

Really asset naming conventions are a file control issue and should be set out at the start of any project by the Technical Director or similar.

There are options for asset management control like Alienware or there is a free asset management tool called Tortoise, this acts like central repos.