If you have an iPad, you should get it and try it (it's free). The interface is really nice. I played like 8 games over the weekend...

*obligatory rant about IGS ratings*: going 6-2 on KGS with no other recent games should raise your rating to the point where you're not sandbagging. Oh well, I guess I'll just have to play more...

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Are you thinking about PandaTetsuki? It is almost 3 years on the iPhone and a year on the iPad since beta was available
There are also WBaduk and Tygem app in the AppStore, but client for IGS is most polished and more customizable.

About rank on the IGS (simplified): if you win you get 100 points, if you lose you get -100, and after about 1000 points you get promotion, so you need to have a more constant winning streak than on kgs to get promotion.
Details at http://www.pandanet-igs.com/communities/pandanet/60

[Edit]Oh, just realized that you probably are more informed about IGS rank system than I am... sorry I just thought you are some newbie

I assume this is the app you are referring to? http://www.gentgo.be/tetsuki/ It looks positively sweet, and if I ever get an iPad this is the first thing I'd install.

Tetsuki has been developed by Kris Van Bael. He's a member of our local Go Club in Ghent, Belgium. I played with him a few times at the club, he's a really nice guy.

Yeah, Panda-tetsuki. I had tried something else a while ago which was much clunkier, that's why I was impressed.

Unfortunately it's not enough to keep me from making really dumb mistakes!

@lobotommy, thanks for the link, I've read it before but a refresher is not a bad idea if I'm going to play there more.

_________________
That which can be destroyed by the truth should be.
--
My (sadly neglected, but not forgotten) project: http://dailyjoseki.com