I'm sorry Alex, but I deleted your email. I'm very reluctant to part with my money and its not possible to ascertain whether I'd be getting value for money or not in terms of quality/quantity of info you'd give me access to.
I don't need to pay for an online listing - you may have a sponsored listing on google but I've done a few searches and I've yet to find your site anywhere else. I expect I'm not the only one who goes on autopilot & skips the sponsored listings (which often are irrelevant to what I'm searching for)!
As well as this forum there are a number of free childminding forums (some with files sections, eg Yahoo! Groups) and policies, advice etc is freely available on these and childminder's own websites.
IMO the CIS search facility is appalling and could be improved in a number of ways. Its true a number of parents I meet have never heard of it and some that have found it didn't give them up to date details. I'd prefer to see a search where a parent could put in their home or work postcode and have the nearest come up first. And it really p**s me off that our CIS won't put ofsted grades on the listing any more - I filled in pages of info they asked for yet they only put a couple of standard lines in my entry which makes all the listings look the same.
I expect a proportion of the current traffic is from the childminders who have recently received your email. of the remaining parents who've found your site the vast majority will live/work too far from me. If I'm going to pay for listing/advertising I need to know that the advert will reach a significant number of parents living/working within a reasonable travelling distance to me.
If I was you I would be giving childminders a free/discounted listing for a limited time period to build up your listings so when parents search your site they get results... childminders who get work thru your site will pay to renew and parents/childminders who find your site helpful/useful will talk about it.
In time, your site could become really well known and if parents prefer to use it instead of the CIS sites or if your newsletter, advice, forum etc can offer me something I can't get from NCMA, other web forums, childminders sites etc then I might reconsider.