I have a sharepoint portal services list. I have an Infopath form
that uses this list to populate a dropdown.

I modify the sharepoint portal services list to only show a filtered
version of initial list. ("available"=Yes). In Infopath designer,
the dropdown shows filtered list. When i publish this form to
sharepoint services portal, and try to fill out the form, the
dropdown is showing all items, not the filtered list.

I really don't know what the problem is.