Hi, enjoy
Total commander for ppc
Switch off GPRS - can toogle GPRS data connection
MobiReader - e-book reader
S2 applications:
http://s2u2.ac-s2.com/
S2U2 - slide lock ( like i-pod touch ) +
S2P -music player cooperating with key lock
S2V -picture viewer
this is almost not for free, but very usefull
Spb software:
http://www.spbsoftwarehouse.com/
SPB backup - can backup all the phone (settings, contacts,apps...)
SPB mobile shell - alternate to touchflo or windows chrome