what happened to my stuff??? site is down..why???

ok, my database is down, site cannot be reached...admin cannot be reached.....

error message 0 DB_ERROR_NOT_CONNECTED
in:
[select * from project_version WHERE project_version_key = 'Zen-Cart Database' ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

i DIDNT touch a thing...it worked fine at 4am this morning!!
iS it because you are redoing your site? (cool, btw). Where did my cart go? where did my admin go? Why am I freaking out? HELP!!

I get that error when the hard drive partition that holds my websites fills up. Are you using a dedicated host? When was the last time you rotated your log files (not just apache, but stuff in /var/log, etc)?

If you are on a shared or managed host, I would be on the phone with their support pronto.