Short guide to add a 4th column to a iGoogle homepage:

mickschroeder.com/2009/06/howt ...

They should read Google Blogoscoped forum...

blogoscoped.com/forum/134429.h ...

... which is the 2nd result for [4th column igoogle] below that blog post you're linking to:

google.com/search?q=4th+column ...

Presumably it was first before he posted that. I wonder when it started working again.

Thanks Tony, maybe he got the inspiration from that earlier post :-). Anyway it's a good tip.