The A's come from the font LastResort. It's very common for font cache data to become corrupt when installing one OS over another. Seems to happen to Safari updates on a fairly regular basis, also.
I don't have Lion yet, so can't confirm if the following Terminal command works. It does for Leopard and Snow Leopard.
Close all running applications. From an administrator account, open the Terminal app and enter the following command. You can also copy/paste it from here into the Terminal window:
sudo atsutil databases -remove
This removes all font cache files. Both for the system and all user font cache files. After running the command, close Terminal and immediately restart your Mac.