The most popular O2 products:

XDA LLI
XDA ORBIT (QUICK GUIDE)
X2
JET
XM
X1B
XDA EXEC
XDA SMART PHONE
CONNECTION MANAGER
XMAIL FOR XDA II
XMAIL
COCOON
ICE
POCKET PC PHONE
XMAIL FOR XDA
X4
XDA ORBIT
X3
CONNECTION MANAGER (INSTALLING FROM THE WEB E)
XDA IQ
X1I