Cleanup HTML using BeautifulSoap or Tidy.
   Parse downloaded file and get javascript redirects.

   More and better documentation.

   Merge "writers" to storage managers.
   New storage managers: shelve, SQL, ZODB, MetaKit.
   More robots (URL checkers): threading, asyncore-based.

   Configuration file for configuring defaults - global defaults for the system
   and local defaults for subsystems.

   Ruleset-based mechanisms to filter out what types of URLs to check: checking
   based on URL schema, host, port, path, filename, extension, etc.

   Detailed reports on robot run - what's old, what's new, what has been moved,
   errors, etc.
   WWW-interface to the report.

   Bigger database. Multiuser database. Robot should operates on a part of
   the DB.
   WWW-interface to the database. User should import/export/edit bookmarks,
   schedule robot run, etc.