In all seriousness, it is bloody tough to do. You need to be really fucking good at trawling the web and you need to offer more than just copy and pasting from the paper.
I know with mine, it's slanted to mostly to Australian (and more specifically Sydney) fans. I also throw in the odd photoshop and details of our events. That's my point of difference.
Danny at Bitter and Blue and Jack at TLDORC really are in a different league as far as City blogging goes and really are wasting their time on Blogger and they should have a bigger forum. Well written, constantly updated, and most importantly, different.