I'll chip in with a recommendation for mortgagefreeinthree. Not much posting happening anymore but I got a lot out of reading through the archive a couple of years ago. If you're UK-based in particular the armageddon cupboard (filled with lots of food from Approved Food) posts might be interesting. This is the blog that I have made more recipes from than any other, I think, and I've used several of the knitting patterns to make very cheap presents, too.
Had a quick flick through this one - interesting! Breadonomics is very much my style. Slightly hard to navigate, though, as I don't want to read the whole archive and can't find anywhere obvious with all the category filters listed together. And the Mumsnet-style writing grates a little...
Has anyone ever shopped at Approved Foods? I've had a look before and all the significant discounts seem to be on junk.