Havent tried this myself but sounds just what your after
TimelyWeb offers you a complete set of features that will automate the process of updated content delivery to your computer:
1. Monitoring of WWW and FTP addresses;
2. Analysis of dynamically generated web pages;
3. Support for WWW, FTP and SOCKS proxies;
4. Support for Secure HTTP (HTTPS)protocol (powered by SecureBlackbox);
5. Monitoring of unlimited number of resources4;
6. Different notification methods:
* send an e-mail or ICQ message;
* display notification;
* open web page in browser;
* download file automatically1;
* put complete Web page to archive;
* create visual difference page;
* execute an external application;
* send message over local network
7. Individual schedule for every task;
8. Easy to use tree-like organization of data;
9. Import and export of links to files in different formats;
10. Automatic creation of web page screenshots;
11. Integration with web browsers and download managers
http://www.timelyweb.com/