A bug in OS X 10.7.3 exposes legacy FileVault users, but there are some workarounds to prevent this from happening.
A debugging error that left some users' passwords stored in plain text in OS X 10.7.3 has been closed in OS X 10.7.4.
The OS X 10.7.3 bug update that was preventing connections after waking from sleep has been fixed.
After updating to OS X 10.7.3 have you not been able to restore your Mac from Time Machine? A quick update from Apple should fix this problem.
A number of OS X users are reporting an odd interface bug after installing OS X 10.7.3, in which window elements show red question marks and the repeated text "CUI" instead of buttons and scroll bars.