Since your forms start out as spreadsheets, why not just use Documents to Go and bypass the whole conversion process.
Combine it with DrobBox and you can keep the forms in the cloud and accessible from both your iPad and computer. Items in Dropbox can be marked as favorites on the the iPad. When you do this DropBox will keep those files synced to the iPad and usable off line.
So here is the scenario I'm thinking.
You have a folder in DropBox with all the standard forms you use. You have all of them favorited, so the iPad hangs on to them and automaticaly updates them on the iPad if you make changes at work.
You open one of these in Documents to Go, and immediate change the name of the document. Make all of your entrees and then save it back to a different folder in DrobBox. Whenever you get back online this form will be automatically synced.
Back in the office you open DropBox on the computer, pull up your excel form and copy paste the information you need back into your records, or however you track things. If you've got a hot script writer you could probably automate that part.
You could actually make your job easier by bypassing the whole PDF thing for data entry.
Now you may have some standard forms that need to be signed or something. Those PDF apps and DropBox would make that sweet too.
Not long ago DropBox gave D7 Consulting a bunch of iPads so they could experiment with using them in the field. It's a good story to follow for those who want to do similar stuff. Here is one of the articles.
Box.net's iPad project at D7 Consulting: How the iPad works at work