The functionality has developed further today. The keyword list can now be tested against any flavour of Google for simple search, exact search and intitle search
I keep tweaking it.....not much fee paying work getting done this week.........
One other thing. I was following Rand Fishkin (Mr SEOMoz) on Twitter and he mentioned a meeting he was going into to discuss SEO tools. I tweeted him (I know....) and got this response from the man himself.
"www.seedkeywords.com is a really interesting concept. I think I'm a fan Definitely going into our roundup links for the week."