DevTeam says that 2.2 update SHOULD NOT be applied using iTunes if you want the chance of a soft-unlock in the near future. Use new version of PwnageTool (not avaliable yet, but will be soon).
Some fact:
SwirlyMMS, application to send and receive mms, is updated to v1.2.9. Several bugs are fixed. See the changelog below.
Avaliable in Cydia for jailbreaked iPhones.
Limitations:
Uploading music and movie to iPhone is now disabled on devices with firmware 2.x.
Quite soon MMS will be avaliable for iPhone users via AppStore. The application is called MMSender. The
For now only users of jailbreaked iPhones can send MMS from application called SwirlyMMS.