Nick Peachy
http://quickshout.blogspot.com/
This guy is my absolute favorite. He is great at showing how to use a seemingly non-educational site for ESL purposes, complete with classroom activity ideas. He has three parts to his site: a daily English activity, a learning tech blog, and a quick shout tech news.
This is one of Nick Peachy's newest additions--it's a nice visual link to his favorite resources.
Larry Ferlazzo
http://larryferlazzo.edublogs.org/
A lot of his apps and links are more for secondary education, but there are a lot of great ideas for ESL.
Free Tech for Teachers
http://www.freetech4teachers.com/
A blog with lots of great links to some of the newest technologies that can be applied to education.
Jane Knight
http://janeknight.typepad.com/
She is particularly good at taking trendy technology and finding application for it (i.e. Twitter, etc.)
Life feast
http://www.lifefeast.blogspot.com/
Another wonderful teacher applying cool new apps to the classroom.
CLEAR: Center for Language Education and Research
http://clear.msu.edu/clear/store/products.php?product_category=online
Not a blog, but a great list of technology sources to use in the classroom. These are downloads, but most are free.