Couple weeks ago I expirensed strange behaivor with IE6 and Moss Page with 5-6 webparts on it. After that background image and title loaded browser(ie6) freeze.  The problem come back after each time that I empty browser cache. After hours of research the problem was discovered and fixed.

Symptom: Page with couple Webparts(under Moss) freeze on page load with empty cache. If page loaded once problem didnt comeback.

Solution: Delete or empty two css files HtmlEditorCustomStyles.css & HtmlEditorTableFormats.css