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ESTIMATED search volume can be got from Wordtracker (now available in the UK). They use a small search provider to get a dataset and then multiply it up to estimate demand across the UK internet.
I've heard that Keyword Discovery is also supposed to be good.
For free, the Google AdWords tool gives you level of demand. As they have the biggest dataset by a loooong way I consider that more important than numbers - especially because the numbers are a guess anyway.
Another technique you could use is to run an Adwords campaign on the specific keyword and measure impressions. If your are looking for historical data this will not help but it can tell you what is going on at the moment.
hope this helps
They rolled out the UK only version last year.
My account rep wouldn't tell me where the data came from for the UK tool but said it was a UK ISP / search provider.
In my view Google is more use (which is why I cancelled my sub) but I see US-centric terms in that even with my region selected as the UK.
The AdWords tool shows you comparative levels of demand for search phrases that people are bidding on in Google. It also shows you comparative levels of competition to be first in the paid results for those phrases.
As far as I am aware, that's as good as it gets.
I want to know whether this tool is for organic search or paid search
There's no such thing as organic search or paid search. There's just search.
Do you say to yourself "I want to buy some shoes so I'll do a PAID search" and "Now I'm looking for information so I'll do an ORGANIC search"?
No, and neither does anyone else.
All tools mentioned in this thread show data for ALL searches and all types of searches. As explained, they come from different sources.
I think you need to read the answers given above a bit closer, because all the information is there.
Then read up on each of the tools yourself and try them out.
So I use Google itself to verify the competition for a keyword as stated by Wordtracker. That way I figure that if Wordtracker (UK) and Google UK are in agreement then the chances are that the rest of the Wordtracker stats for that particular keyword are probably ok - including volume.