A client requests to manage web browsing, specifically to have these

Some users unrestricted, others restricted to a specific list of web

Manage allowed list of web sites by the user or group.

User admin of the list, e.g., someone says, "I need to use this site"
and the office manager has an interface by which to add the new site to
the list. A text file would suffice.

Netware 6.5, currently BM 38/SP4/IR3. All w/s XP/Pro, mix of IE 6 and
7, all using a BM proxy which points to a secondary IP address on a BM

Thanks in advance for produce recommendations, war stories, etc.