do the following:
open cydia and add these sources:
http://repo.beyouriphone.com
http://sinfuliphonerepo.com
http://cydia.xsellize.com
then download these programs:
*backgrounder – run programs in the brackground and have them ready to come back up without losing info.
*categories – You can put apps into folders and organize you stuff
*AppSync – Allows you to sync cracked apps with iTunes
*install0us – free paid apps
*sbsettings – quick setting changes
*winterboard – customize your phone
*video recorder for 3G (from beyoip source) – record video
*iblacklist (from beyoip source) – block unlimited calls and mms
*pdanet or mywi (from sinfuliphone source) – Free tethering
*OS 3.0 lets you tether without the use of any external programs or creating an adhock network.*
there is way more stuff you can do but these are the essentials.