I'm currently really into Mecha-ike
Besides the regulars you mentioned, there have been new regulars added since 2010. They are Tanpopo, Jaru-jaru, Atsushi, Shigemori Satomi and Sannaka(Sanchan). Gokuraku Tombo's Yamamoto has also left the show since 2006.
There are lots of interesting series and episodes. There's the Test series, the Okamura got an offer series(the Johnny's Jr. episode is part of this series), the Fuji TV police series, fooling Hamaguchi series, etc.
Then, there's the parodies of people, CMs, other shows...
Here's a video in which the Fuji Tv police(Okamura, Yabe, Hamaguchi, Kato) attempt to arrest Hamada for being a "yakuza" lolhttp://www.youtube.com/watch?v=bcw1_C3AX74