I'd say just do some searching. Maybe try a big community like Blog Catalog or just follow the Blogroll of a tech/blogging blog you respect. Actually putting some time into it will find much more valuable targets than some random list. Carefully write a guest post request and just send it to the webmaster. Most big blogs won't blatantly advertise guest posting but you'd be surprised at how many would respond positively to a good request. That said, I'm sure some other users will be able to come up with some specific examples. Best of luck to you.
I suggest you to use contact form of any tech blog you are interested in with polite words request for Guest Post.