Tom, I've used PSP 7 for years and just got XI the other day. As near as I can tell it does pretty much the same thing as 7 and  can use the same plug-ins etc... but also adds a few auto corrections and some form of RAW handling which I haven't tried yet.  It also seems, to me, to be a bit slower. I was able to get it at quite a discount from Best Buy (29.99) or I probably wouldn't have gotten it as I don't really see that it does a whole lot more than I'm able to do with 7.

Manning