I have used LWP::Simple to get and parse web pages in the past, but I haven't yet learned what tools would be appropriate to access some of the more interesting (to me) data out there. I'm referring to web sites that require login before the data of interest is available. For examples: real-time stock quotes from brokerage accounts, automated retrieval of web-based email, automated retrieval of online banking transactions, etc.
The answer to this is undoubtedly RTFM, but any pointers to particular documentation would be great.
Josh