SliceAndDiceData.com (Innovative Computing)
This firm will process your data or Census data with multi-dimensional cross-tabs (up to 26 dimensions, though typically less). Their "MAST" tool for this processing is said to be quite efficient, and can actually work on all U.S. Census long form data. More typically when using Census data, they use the PUMS 5% sample (Public Use Microdata Sample), which has data from the long form.
Note that they process your request -- their tools are in-house and not on-line. Turnaround is typically overnight.