When I had my site on Tumblr, my bounce rate for any article was almost 100%.
That's because the old design just displayed the page text and didn't have any links to other pages. While some pages on the site were getting lots of hits, people came to a dead end, and didn't explore my site any further.
To try and keep people at the site, I've added a similar posts option at the bottom of each page, which lists other blog posts that talk about related topics. If the post that brought someone to my website catches a visitors interest, once they are finished, the list might encourage them t explore other parts of my website as well.
I've also added feeds from my delicious, last.fm, and twitter accounts to add a bit of personality to the site.
