I have been using the previous home for some of these tools for some time now, mainly because almost all the tools had tens of datacenters on which you could’ve searched for information, including indexed pages, backlinks and cache times.
Since most of the multiple datacenters tools are restricted to Pagerank and (very few) to indexed pages, Ciprian’s tools were a Godsend.
There a lot of basic tools in the collection. Nevertheless the ones that really help me are the SEO strength (a complete package of the basic stats like backlinks, indexed pages and PR), indexed pages, inbound links, Google keyword ranking and the Google cache.
I think Ciprian should work on the keyword research tool a little bit more. It gives me some wierd results.
Leaving that aside, Ciprian, I think you should also put a link to the Google SERPs, on all the datacenters in the results pages of the SEO tools, so that users can check that result in real time too.
Like most other similar services on the web, Ciprian’s tools have their share of downtime, slow response times and timeouts, but the team is working hard to improve these problems every day.
None of the tools require any user account and they are all free for unlimited use. Have fun.