It's looking a bit thin out there these days for quality informational (non-humor) cat blogs, but here are a handful of respectable sites that we found both useful and interesting:
Cats Problems - As it's name implies, this British site is an excellent resource for any problems that you may encounter with your cat.
The Messybeast Cat Resource Archive - Another great site with comprehensive, well researched information.
And because you can't google "cats" without some fluff coming up:
Cats n' Stuff - A great site with many funny and cute pictures.
Wrap you mind around this.....