Nice find Pallo. I loved to see the stats from the incoming users at AlltheWeb. With the 2-3 months old index at Google, I think ATW gonna take some pie share the next few months! Check your logs folks.
You'll find the spell checker [alltheweb.com], a dictionary and a thesaurus function as well. ATW uses dictionary.reference.com for these and you'll find the option next to the "Results for.." at the top of the serps.
New cool featuers just keep on coming from the Fast guys. Last week we reported the launch of the calculator and converter [webmasterworld.com].
Really nice toys, I wonder what's left for them to offer now :)
I think the dictionary and thesaurus lookup function has been there a while [alltheweb.com].
My guess is that the next new feature will be translations, probably using Altavista's Babelfish since Overture own both ATW and Altavista now. But the existing features will probably be improved too (the spell checker could need a better dictionary).