Hi, I don't know which resources shipped with XI but I know that back around PSP9 Jasc stopped shipping all the goodies with the program and had a site on the web where we could go and download them again. It seems that, that site comes and goes nowdays.
Sorry I am on my way out the door and don't have time to do a search of the psp fourm here for "resources" but I know we have a lot of posts where this particular is posted. Also check in the References - Links and Resource pages here at SBB as I know this link is posted in there also!
Another way to get fancy shapes is to create your text as vector text, use a ding font and you will get more fancy shapes then you can shake a stick at!
If you are google searching for items for XI leave out that part and just google search "Paint Shop Pro shapes" Most all the older resources should work in PSPXI and you will turn up a lot more items also.
Good luck and have fun!