Here are the top 25 Classical Blogs as of today (they recalculate the statistics every day), with the change from my last Technorati ranking in parentheses. I don't have the links to the blogs, out of deference to Invesp.com. Follow the link to their ranking and then click through to the blogs of interest.
1. The Rest is Noise: Alex Ross, music critic (no change in rank from my last ranking)
2. Sequenza21: Jerry Bowles, new music and composers (+2)
3. La Cieca, James Jorden, opera (+6)
4. Wolf Trap Opera (never been on my lists)
5. NewMusicBox (the e-magazine, I've never included this because it has non-blog elements)
6. Opera Chic (-4)
7. Ionarts: Charles T. Downey, musicologist and critic (no change)
8. On An Overgrown Path: Bob Shingleton, producer (+3)
9. Jessica Duchen's classical music blog, critic and author (+1)
10. slipped disc, Norman Lebrecht, music critic (didn't make the list last time)
11. Mind the Gap: Molly Sheridan, music critic (was too new for my previous rankings)
12. Jason Heath's Double Bass Blog: (+19)
13. Opera Today (another e-magazine, even harder to call this a blog than NewMusicBox)
14. Dial "M" for Musicology, Phil Ford and Jonathan Bellman, musicologists (-1)
15. aworks: "new" american classical music, Robert Gable, enthusiast (-2)
16. The Collaborative Piano Blog: Chris Foley (+10)
17. mostly opera...: (-2)
18. BIS New Releases (not really a blog, the listing of Naxos new releases)
19. Out of Focus (not a music blog)
20. Musical Perceptions: me (+1)
21. Adaptistration, Drew McManus, consultant to the
22. finding my singing voice: Catherine K. Brown, vocalist (new to me)
23. The Rambler: Tim Rutherford-Johnson, musicologist and critic (and British!) (-6)
24. Jason Weinberger's blog: conductor and clarinetist (new to me)
25. The Omniscient Mussel: Marcia Adair, music critic (didn't make my last list)
There are some heavy hitters from my previous rankings who Invesp.com clearly don't know about, like Kyle Gann (PostClassic), and Greg Sandow. Some of the other highly ranked blogs from my previous lists are found in subcategories, like the number of pages indexed by Google and the number of incoming links. I don't know how Invesp.com weights the stats that kept them out of the top 25, especially AC Douglas (Sounds & Fury), Steve Smith (Night after Night), and Lisa Hirsch (the Iron Tongue of Midnight).