As someone who is on the tail end of a 700 computer migration from WinXP to Win7, I feel their pain. A single critical program that won't run on Win7 can be a showstopper. Not to mention special hardware for which no Win7 drivers are available - all of a sudden that $120 upgrade cost for a Win7 license became $25,120 when you include the cost of a new laser engraver.
You can always run XP Mode in Win 7 Virtual PC. That's what my organization did when we upgraded to Win 7. We had a few programs that were tied to XP; so, we ran those programs in Win 7 Virtual PC-Windows XP Mode. Problem solved.