pretty much as per Dan's description. Not nearly as good or funny as yer Tim Minchin (who I also have tickets to. WOO.), but 347 times more geeky. Is that a good thing? Yes. i think so. Musical humorz. Win.
I am going to throw a name out there - Stephen Lynch
He's an american singing comic and is awesome, don't listen if easily offended. check him out on itunes.
Saw him live last year and was blown away (had never heard of him)