I got the Academic version as well. There's no difference between the retail version, as far as capabilities are concerned. It's the same binary.
With larger, more expensive application suites like CS3 and MS Office, the difference between Academic and Retail shows up when you want to upgrade to the next major version. A 'retail' license will often entitle you to a discount on the newer version, whereas academic licenses often don't.
With VMWare Fusion, if this is mentioned in the license agreement, it's not a big deal since VMWare is so inexpensive anyway (compared to Adobe and Microsoft).
(there are other restrictions that usually apply to academic licensing, usually regarding non-commercial use, etc., but these probably wouldn't apply to Fusion either).