here are some links for your info

http://www.tech-recipes.com/rx/2342/sql_server_2005_move_tempdb/

http://www.google.com/search?sourceid=navclient&aq=t&ie=UTF-8&rlz=1T4GFRG_enUS212US233&q=split+tempdb+into+multiple+files

http://support.microsoft.com/kb/328551

http://www.mssqltips.com/tip.asp?tip=1432