Interesting Jon. And I know what you are getting out. But to use one of my sites as an example I don't think your tool fairly represents every situation.
1800realitycheck.com is a tool that helps vistors determine what is selling on eBay Pulse right now. Now normally it is said that eBay Pulse is good in determining popular searches but not necessarily what items are selling the best. However, I developed this site to scan through eBay Pulse and to pick out highest bids within each category. Obviously an item currently receiving 40 bids is a "hot item". The premise of my site being that if you do this enough... say for 30 days... you can see hot niches developing within eBay's most popular categories... IF these niches are there you will see them.
Ok, now with that all said I think this is a pretty valuable tool for anyone searching with these particular keywords:
discover what sells on ebay
what sells on ebay
This site always ranks high in Google with these keywords (in particular, there are many more but this is enough here).
Right now we're at number 4 with "discover what sells on ebay" (About 42,100,000 results)... I have an article at number 2 but that besides the point here.
"what sells on ebay" has us at number 8 (depends on which side the sun comes up I guess because we'll go between 4 and 8 ) (About 4,420,000 results).
Now understand, my tool will answer the question on every visitor's mind in REAL TIME. It's an application, not merely a bunch of gathered up gobbly-gook cramed into some sort of eBook or "course".
Shablast has us at #23 for "what sells on ebay" with 3 %. And at #25 for "discover what sells on ebay" with 3%. Meanwhile, we're also listed at #23 under whois.domaintools.com with 4 %! In other words, whois.domaintools.com which DOESN'T ANSWER the questions of what sells on ebay is said to have more information and thus is ranked slightly higher. All you find on that site is data about MY site, but no answers to the basic question. It doesn't serve the purpose the searcher is looking for (i.e. waste of time).
Also, because the other sites ahead of us use OLD INFORMATION... whereas, like I said, my site will give the vistor exactly what they are looking for IN CURRENT UP-TO-DATE FASHION the searcher stands to get a better answer at my site then anywhere else yet we are listed below 20 in Shablast.
Two other points:
Shablast is slow.
It doesn't give you an approximate search count as Google does.
So, in summary, it's "interesting" but I don't think Shablast covers all the bases... it needs more work to be really impressive.
Oh BTW: #21 with 8 % is an affiliate promoting my site! And, #14 has nothing to do with what sells on ebay.