Here is an interesting API tool that shows the keyword popularity in Digg. You can customize it to show hot keywords for certain categories. You can find what's hot and what's not.
Wow, that's pretty cool Bo. Thanks for letting us know.
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Love your comment Tx. Problem with social bookmarking clouds and tags is that they usually are single word very broad niches or meganiches. Breaking into them would be really difficult for a newbie
Monetising them is another big issue.
Also how does this work with long tail and tightly focussed niches
I suppose it is a place to start though and then you can drill down