I really wish the SMF connection errors would give more detail... let alone all SMF errors.... maybe even Apache.
Actually, on one of my paid hosts, I have the option of getting extensive information on the error pages... it can be useful, however, little of it has to do with the server.
Nathan,
Open up your favorite SSH program, and log into your server, and run the command "top"
Hows your memory and processes looking in there, and CPU resources?