Time to Check Out the New InfoPath 2003 Service Pack 1 (SP-1) Preview
From Tabula PC:
...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!