I've checked through my blogroll and checked that the sites I've linked to are either
a) VERY useful/interesting, or
b) interesting AND have a link on their blogroll to my site!
I've cleared out a few links to miscellaneous blogs that I only visit occasionally (when an interesting post appears in pfblogs) if my site hasn't been included in their blogroll (I'm sure I emailed each of them requesting a link back when I first added each site to my blogroll).
If anyone has included my site on their blogroll (or wants to), let me know and I'll be sure to add your site to my blogroll (provided your blog content is interesting!)