Dear MarkyMark,
Congratulations to you, you just did a good deal purchasing the XP80. I use a XP50 with 60's and 70's expansion board in my perfomance equipment and it does a great job for me!
And yes, there are some very good patches available on the net, just check out the different links on synthzone's roland page.
If you are looking for software to exchange sysex-files, I recommend Jürgen Moßgraber's "ChangeIt" to you (available in the same place). Nervertheless, if you are looking for some awesome Hammond B3 emulations, there will be no way beside the 60's and 70's expansion board. But it's worth the money, not kidding!!
Hope that's enough information for the first time and you get what you want,
Armani