.offset() improvements needed

.offset() improvements needed

The APE library recently released some information on library
compatibility of .offset() methods and speed:
http://dhtmlkitchen.com/ape/example/dom/compare/
The test suite used:
http://dhtmlkitchen.com/ape/test/tests/dom/position-f-test.html
To start, we need to investigate the relative positioning issues in
Firefox 2 and Safari 3.
I know that we've looked at performance issues in the past - but are
there any additional thoughts?
--John