it depends what you use your ppc for.
I use my ppc a lot for for multimedia and datatransport so PocketDivx (nice 10band EQ), TotalcommanderCE, MSN and netuse (to change workgroup and map dirs) are my most used appz for now... but who knows whay I'll be doing tomorrow :)
www.projectmayo.com
www.wincommander.com
www.phm.lu <- very nice one (regeditor and much more stuff)