Authors always say the best way to write better is to read more, which I can vouch for in blogging. Building up some RSS feeds in an aggregator like The Old Reader can be a great source of inspiration.
But it’s also important to stress that this is only one approach. 8,000 posts sounds superficially impressive, but doesn’t speak to quality or detail. Writing a few posts a year is just as valid and worthwhile. If you’re having fun doing it, who cares. — 8,000 post feedback, and regular writing