1st site looks brutal when I peeped it in Firefox. However, to make one like it just get a script that can parse RSS feeds (php, asp, java, etc...). Write a wrapper around it to grab those feeds at a set interval (i.e. every 15 minutes) and write it the output to a DB / html file / text file, whatever. Your front-end will just pull together the stuff you aggregate.
The second website, well, I'd guess they're crawling known websites with predetermined regular expressions and grabbing the stuff they want. That's just a guess though.
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