Finding the time to read everything you want to online is tough. Podcastomatic is a webapp that makes it a little easier by converting your favourite blogs into podcasts.
Podcastomatic uses standard text-to-speech software, so don't expect a beautiful voice to fill your ears with your favourite blogs. That said, it works well and it's a fast process. Simply type in the URL of the blog you want converted, and Pocastomatic automatically creates audio files for each blog entry. You can then subscribe to the RSS feed for the podcast in iTunes, or download each entry separately.