I'm facing them today, I'll face them tomorrow, I'll keep facing them so long as people aspire to screens the size of football fields (he said staring into his tennis-court sized monitor) and definitive "YES/NO" usability answers.
Jakob Nielsen's Alertbox, July 31, 2006: Screen Resolution and Page Layout
This tool makes little movies of a users' mouse movements and then analyses the results to tell you which areas of the page are most moused over, whether users are scrolling and by how much etc.
Slightly 'Big Brother is Watching You' but the assure us that there's nothing sinister going on.