I was having the same problem yesterday. All of a sudden I couldn't log into SL. I uninstalled, did a clean reinstall, kept crashing SL and the crash logger. Finally I wired up my laptop, entered SL in "basic mode," and was able to get into SL. I switched to advance, logged out, and logged back in. Once my inventory loaded I logged off again, removed the wire from the modem, and re-logged and was able to get back in. Of course, I haven't tried getting into SL today yet....