I've updated the list of current mission blogs with the additions of Elder Dayton and Elder Lewis (both serving French speaking), and Elder & Sister Linton, a senior couple. The archive has been updated, and a link for Prepared to Serve has a list of mission blogs for the West Indies from 2009 to current.
If you know of any other actively updated blogs, please feel free to comment.
Link to the archive: http://brissononamission.blogspot.com/2013/08/mission-blogs-archive.html
In terms of other updates, I know that currently, missionaries are only allowed to listen to Mormon Tabernacle Choir and (perhaps) instrumental music.
I've just added Sister Hodge, Sister Munafo, and Sister Riley's blogs to the list.
Also, there are several "mission sites" for missionaries, but they do not have any letters. If you're interested in seeing them, click "Links" on the side bar of the mission site.