Work yet to be done

More advanced tutorial-style documentation

An example that spiders a Haddock package's docs to validate its internal and external links

Integration with tagsoup (see the mess in UploadPaste.hs)

International domain support?

Better authentication support, including session-long memory of which URLs do and don't need authentication

Some poor sod needs to add digest authentication to http-client so we can use it

Cache management