Dear Anonymous Monk,

What exactly is your question? Is it whether this kind of site diffing has been done before? Or is it whether this kind of thing is doable? (it clearly is in Perl) Or is it a question of needing help on how best to do it?

Usually, you will get helpful feedback if you post code, to show what you have tried so far. Alternatively, post pseudocode showing your intended design. This is not a site where you can go and expect people to write substantial code for you for free.

However, if you just need some tips on which modules to look into, look at the following:

• WWW::Mechanize for doing the LWP donkey work
• HTML::TokeParser for parsing the HTML
• DBI and a DBD database driver
• Class::DBI to provide an object layer and save writing SQL
• VCS::Lite for the diffing

Hope this helps