1) Grab RSS from various selected feeds every X minutes
2) Apply blacklist or whitelist filters on feeds (which?)
3a) Export the filtered RSS (or combine them) and host them (for example on Ovi) as RSS (or, instead of RSS, possibly as HTML + e.g. JS on say Ovi)
3b) Keep track of previous send and e-mail each item seperate (seperate account from main account in case of POP3, or e-mail client & server supports IMAP). Or even SMS them for a small fee (some services for this already exist).
3c) Same as 3a, with or without blacklist but with high priority whitelist. If whitelist matches, e-mail (or SMS) the item instead of RSS because we're positive the user is very interested in this item.