Updated 21 March 2009. This is the list of Web 2.x sites that have greatly gained popularity in the last months.

1. fmylife.com (553.8) — F My Life! Stories about how can you screw your own life. Makes you feel really good about your own life.  I've started my own translation of it to Russian at humj.ru.
2. en.wordpress.com (553.3) — We can always use more blogs! Morbo demands more blogs!
3. mylife.com (541.7) — Well, my bet is that this one is due to the fact that some people forget that my life has "f" in front of it.
4. gigapedia.com (275.4) — Seems spammy.
5. [adult] (267.7) — ...
6. [adult] (235.0) — ...
7. [adult] (146.9) — ...
8. blinkogold.fr (137.8) — I have no idea. Some GSM provider?
9. worldbaseballclassic.com (129.3) — World Baseball Classic. Apparently.
10. adnet.de (124.3) — Some corporate site. Although I don't understand German language.
11. ing.nl (112.6) — Holland's Bank. They really should've named their domains like private-bank.ing.nl or money-lend.ing.nl.
12. gutteruncensored.com (112.0) — This was probably something adult. Although now there's nothing.
13. iqquizapp.com (106.0) — This one is interesting. Although traffic to it greatly increased, the site itself doesn't seem to exist. At least at the moment.
14. pop-bazar.com (98.7) — Yet another one of "pop-up/pop-under" Russian sites.
15. dailyfill.com (95.7) — Did you hear that Halle Berry is now.. eh.. does it matter? Well, if it does for you - then welcome abord to this site.
16. [adult] (90.4) — ...
17. kunlun.com (88.3) — I have less than no idea what this is... Dragon & Bumpkin? What tha?...
18. fdnlinks.com (84.2) — Free link hiding service. No idea. Although the phrase "if the person installs the client" makes me think about malware (not verified/substantiated, just a guess).
19. ranknow.cn (80.6) — Chinese SEO? Well, seeming their traffic is raising - could be legit.
20. racingpost.com (80.1) — Didn't load for me, but seems to be about horse racing. Racecards, etc.
21. wyzx.cn (79.6) — Wasn't loading at the moment, but seems to be Chinese review of MMORPGs?
22. kaixin001.com/~slave (78.0) — Chinese Facebook?
23. 88.208.30.5 (77.1) — Yet another Popup network.
24. nuncamas.org (76.8) — Spanish versions of Illegal TV Shows?
25. seriesgringas.us (76.5) — And another one?
26. [adult] (76.4) — ...
27. kaixin001.com/~parking (74.4) — Chinese Facebook?
28. windowslive.co.uk (74.3) — Windows Live, in UK.
29. raincitystory.com (69.4) — Seemingly random blog. Did I tell how Morbo feels about blogs already?
30. [adult] (68.9) — ...
31. oscar.com (67.7) — 81st Annual Academy Awards
32. wlhnjd.com (66.1) — If you like pink colors and can read... Arabic? Google thinks that this is about "World of Eve" and maybe "Court poets". Still, something tells me a woman did this site...
33. popohefei.com (65.3) — Green fishes and up arrows. Yet another site where I have no idea what's going on.
34. cbssports.com (61.8) — CBS Sports. Do I need to explain?
35. youxiya.com (60.2) — Another Chinese site that didn't load.
36. ifengshang.com (59.9) — Another one
37. [adult] (59.4) — ...
38. lavago.com (59.3) — Another one
39. look.com (58.6) — Which celebrity do you look most like. Apparently. Didn't load either, but seems legit.
40. jamb.org.ng (57.8) — Isn't loading, ATM.
41. patkoy.net (57.3) — Isn't loading, ATM.
42. 178.com (57.2) — Chinese. Seems to be gaming-related.
43. 1718china.com (54.8) — Chinese. Judging by AMD and DDR brands, hardward-oriented.
44. [didn't respond, probably adult] (54.7) — ...
45. [adult] (54.0) — ...
46. worldmathsday.com (53.9) — Happy math day. March 4.
47. mingsuo.com (53.1) — Asian. Possibly a search engine.
48. job1516.com (50.3) — Asian. No idea.
49. emailfinder.com (49.8) — Reverse e-mail finder. I suspect fraud, either SPAM-related, or just fraud-related.
50. custojusto.pt (49.7) — Portugal's billboard: cars, homes, etc. Think Craigslist.

I do plan to update this list at this location, so bookmark it.