If your resolution is set that high and your browser is running full-screen, nothing should be cut off. I run my browser full-screen here at my office on a 1024x768 resolution and I can see everything fine.
On large posts with things like pictures that go off-screen, I have scroll bars. If you don't have scroll bars, it may be your browser version. Internet Explorer 7 and FireFox 2 are the latest releases so people might want to consider updating. Actually, Microsoft has placed IE7 in their Windows Updates, so if people keep their computers up-to-date this should have been automatically installed anyway for security purposes.
And as always, if you are using AOL... well, that's a bad idea, because AOL hates a lot of websites, including this one Things never show up properly.
Ryan