MOSS has the capability for a workflow participant to fill an initiation form to start a workflow. The initiation form can have fields that support:

Single line of text

Multiple lines of text

Number (up/down counter arrows)

Yes/No (Checkbox)

Choice (dropdowns)

Date and time (calendar)

One can use these to create forms by using custom application pages (aspx pages), which are deployed to run out of the _layout directory on MOSS server or using Microsoft Office Infopath 2007