[support] Can't Access Modules!?

I've been working on a site today. Everything seems to be going well. But, all of a sudden, when I try to Administer->Modules, the page comes back blank. I was installing, enabling, and disabling modules just earlier without problems. Now, I just get a blank page for http://my_drupal_site/admin/modules. All the other administrative links seem to work. I did find the following in the httpd error_log:

Allowed memory size of 8388608 bytes exhausted (tried to allocate 64 bytes)

What did I do wrong?

-- Jiann-Ming Su "I have to decide between two equally frightening options. If I wanted to do that, I'd vote." --Duckman "The system's broke, Hank. The election baby has peed in the bath water. You got to throw 'em both out." --Dale Gribble