It’s a love/hate relationship. These top (insert random number here) sites list can get out of control. Sometimes it looks like these websites are saying “Hey, look at me, we know what is cool. Let us prove it by tell you the coolest sites we know about.” Sometimes you want to say, if you know about it – it’s probably not cool anymore.

So – then there is the love part, I’m not sure if I’m trying to validate that I know what I’m talking about – or what. But this is an article from MSN/PC World that shows us the top 25. Highlights:
Yahoo Pipes
Like Popfly, Yahoo Pipes lets you create your own mashups or “pipes.” As with Popfly, you drag and drop prebuilt modules, and then create connections between them. But Yahoo Pipes is much harder to use than Popfly, and the way to go about building your own mashup isn’t always obvious. But if you’re willing to do some digging and learning, you can build very useful stuff, such as a mashup that uses Yahoo maps to show the locations of all apartments for rent in a certain neighborhood.

Pageflakes
The Web is just as chaotic as the world–but Pageflakes can organize both of them for you. This super-customizable version of a home page enables you to pick the news and information feeds you want to read, and to specify the “flakes,” or applets, you want to include. Flakes let you add all sorts of cool stuff to your page–movie times, to-do lists, a notepad, e-mail, a horoscope–even sudoku or a personal blog. If you’re looking for one-stop browsing, this is it.

PopURLs
If you’re an information hound, you probably spend lots of time jumping from Digg to Del.icio.us to YouTube to Fark to Google News to anything-dot-com. With PopURLs, you no longer need to waste time hopping around the Internet. An aggregator of all things informative, PopURLs features massive lists of headlines, videos, blogs, and content from all of those sites, as well as plenty of others. One nice bonus is that you can search some of the sites–Del.icio.us, Flickr, and Wikipedia, among others–straight from PopURLs. It’s also easy to tweak the way PopURLs looks and works, too, including customizing the layout of the feeds so you can put the ones you view most regularly on top. The scrapbook is a particularly useful feature; just click the ‘Add to Scrapbook’ button next to any headline, and PopURLs will save it (and up to 19 other favorite items).