Eliminating the ikee worm is the least painful of the three.
Begin by using downloading the MobileTerminal app from Cydia and installing it on your iPhone if you don't already have it. Restart.
Open up the MobileTerminal app and login under your root account (if you haven't changed the password yet, the login is "root" and the password is "alpine").
Use the following commands to delete these files. These commands are case-sensitive, so be careful.
If that doesn't do it, an alternate version of the ikee worm requires you to remove these files instead.
If you removed the above four files, you'll
have to reinstall Cydia.
Users worried about iPhone/Privacy.A will need to rely on their antivirus software to catch it on their computers (Intego's VirusBarrier X5 will catch it for the Mac) but it's unclear if any of the big security software companies have addressed it yet.
users infected with the third worm, there's no fix at the present short of backing up your data and restoring your firmware to factory conditions.