Korgul, Mrs. desmocat had a very similiar problem with a Metaframe XP server running on Windows 2000 Advanced Server doing the same thing, the memory dumps, etc.
Here is some help for your situation from her:
Part of our problem was the Multitech serial cards. But we also redirected our printers using the WTSUPRN.INF file located in Winnt\System32 folder. We redirected every HP printer that was listed to either a HP Laserjet, HP Deskjet or HP Laserjet 4 for the new printers. Didn't have to change the printer drivers on the machines connecting just the WTSUPRN.INF file which tells it to use a certain driver when it sees a printer connecting with one that needs to be redirected. We also forced all the connection to only connect the default printer which limits the numbers of printers that are trying to autocreate at one time. No more fax printers!
We were also running Citrix on the same system and had memory dumps that we were never able to completely get rid of until we installed on a slower and older machine (no more crashes).
Hope this helps as we haven't been able to get any help from Citrix on any of our problem either. The support forum also has tons of issues relating to printers but no real solutions. After swapping out the Multitech cards with Digi cards and using WTSUPRN.INF to redirect all printers in the list we have been up for one whole week without any memory dumps, and believe me that is a record!
END Mrs. desmocat help file.....
If you want to ask her some more stuff, just send an E-mail our way and maybe she could lend a hand. She says she wished someone could have helped her out when they were encountering all their problems. Don't pull too much hair out.

desmo