I generally have about 5 - 10 IE windows open, and about 10 tabs in each of those. I've noticed since installing IE8 that once I get too many tabs open, things start going wonky on the screen, similar to the windows desktop heap size issue:
http://weblogs.asp.net/jgalloway/archive/2008/01/14/registry-setting-keeps-windows-from-wigging-out-when-you-open-lots-of-ie7-tabs.aspx
However, I have fixed that registry setting and all was well until I installed IE8.
Now, when I get lots of IE windows and tabs open, eventually things start to go weird (windows don't redraw correctly, etc). So as a remedy, I try and close off as many tabs and windows as possible, which will clear things up for a while. But once I get lots of stuff open later, I will see tabs that I closed literally hours ago show up in the browser window, but they are not clickable, and if you resize the browser, they disappear. So it seems they aren't truly being unloaded.
Am I the only one seeing this??