InfoPath 2003 SP 1 Preview - run, don't walk, to get it!
...However, it also has one "simple" feature that blows the mind: an elegant way to fill forms using ink on a Tablet PC. InfoPath automatically senses that it's running on a tablet (nice touch) and turns on "Ink Entry Mode". The form still looks the same, with "textbox" fields, but you can now write on top of them, into a little overlay area that expands to accommodate your writing, and it then gets converted into text...

So don't just hang around here, go get the preview!