I installed a spreadsheet application called SpreadCE. It syncs beautifully with Excel and supports many more commands than Pocket Excel. Added bonus: it does not convert the file to .pxl but rather leaves it in .xls format :)
The trial is full-featured but gives the occasional pop-up asking you to register. I love it so much, I shelled out the 20 bucks.
http://www.byedesign.freeserve.co.uk/
(Download the "sprepaen.zip" file.)