A friend of mine was doing a research about most used blogs and generated a Compete statistic. I couldn’t find any other statistic, may it’s helpful for some of you – as it was for me.

No URL People
1 blogger.com / blogspot 29,930.939
2 wordpress.com 12,006.976
3 typepad.com 7,688.692
4 livejournal.com 3,400.522
5 xanga.com 2,133.020
6 blogcheese.com 972.000
7 vox.com 790.378
8 ufem.com 626.000
9 Twitter.com 504.868
10 blogsome.com 394.263
11 xanco 335.000
12 zoomshare.com 317.929
13 tumblr.com 300.011
14 windowslivespaces.com 288.000
15 greatestjournal.com 235.508
16 blog.com 181.398
17 jaiku.com 143.775
18 pownce.com 104.042
19 blogspirit.com 63.860
20 blogster.com 61.825
21 moveabletype.org 36.757
22 insanejournal.com 27.961
23 yahoo360.com 10.964
24 busythumbs.com 10.609
25 blogr.com 3.934
26 blogabond.com 2.334
27 trippert.com 1.342

Source: http://siteanalytics.compete.com