The Open Mobile Alliance validator keeps links to validated profiles. However the manufacturers do remove old profiles, or in some cases the manufacturers no longer exist, which is probably why you are seeing broken links at uaprof.com.
Google is another good source of profiles by searching for "uaprof filetype:xml" and "uaprof filetype:rdf".
Alternatively check out WURFL. This is not UAProf, but the data is derived from UAProf, it's XML so it is easier to process, and it is curated so it will not have the same problems.
There are more UAProf resources at the DELI website.