Text to speech programs have been around for ages, but they’re generally quite ‘robotic’ sounding & they never quite get the pronunciation of those difficult words right.
Odiogo is a free online service that has the best quality I’ve found to date. You just enter your blog URL, get a piece of code & add it to your blog. I’ve just set it up in the top right of the sidebar.
If you click through you have the option of signing up for a feed, or you can just listen to the posts there on the page.