iPrint is an awesome product, but I like Webaccess because it allows iPrint and all the other solutions to run as gadgets in the page. Webaccess is pretty much a stripped down version of Portal services. We just got NIMS installed on Friday and ran its gadget through webaccess. It had sweet GUI and even calander options. Groupwise has even more functionality, but we haven't tested it simply because it's not in the ALA.
As far as running the newer products on a Netware 5.1 server, you can do it, but I don't reccommend it. Netware 6 licensing is awesome in the aspect that there are no longer any server licenses. You only need user licenses and can run as many servers as you want in the tree. This makes Netware 6 so much more powerful because you can designate the more intensive services to their own servers and even setup 2 node clusters. If 2 nodes aren't enough, you can pay a 1 time fee of about $5000 and run 4 node clusters. They do support up to 32 nodes, but the pricing is a little outrageous... Netware makes Microsoft's pricing look SOOO bad when you consider the functionality, the services, the price, and the ease of use. I can't believe that I used to hate Novell for their design...Client 32 is just bad, but with a web-based setup, you no longer have that problem and you can access this from home, work, a tropical island....wherever! By the way, I don't work for Novell...I'm just excited and happy (got my CNA a month ago).
-Ryan