^In korea they don't release singles so often like they do in Japan, they mostly release an album and they promote the songs on it for like a year, like they do in america. Super Junior released first and album in 2005 and they promoted two songs like hell and then, in 2006, the single U came, with the new member, Kyuhyun. After that, they didn't did much because of certain problems and when they were going to release their 2nd album, like one or two months before, the car accident happened so they weren't that active until the Summer 2007 SMTOWN album was released and they promoted H.O.T's Haengbok without Kyuhyun (because of the injuries of the accident). After like two or three weeks after they finished the Haengbok perfs, the 2nd album was released, with Kyuhyun back in the stage but for a few moments since he wasn't 100% recovered to dance the song.
So, in terms of singles, they barely release singles.
it's like this:
2005 -
Super Junior 05 album (songs to promote: Twins, Miracle / All members minus - Original 12 members)
-
Show me your Love (with DBSK/TVXQ/THSK / All members minus - Original 12 members).
2006 -
U single (All 12 members + new member Kyuhyun)
-
'06 Summer SMTOWN (Suju song to promote: Dancing Out / All 13 members)
-
2006 Winter SMTOWN (Suju song to promote: Tic! Toc / All 13 members. ~ Super Junior K.R.Y. song to promote: Just You)
-
Hyena OST ( Suju K.R.Y
(Kyuhyun, Ryeowook, Yesung) song to promote: The Night Chicago Died, 한 사람만을 & Smile (KyuHyun))
2007 -
Rokkuguh!!! (Songs to promote: Rokkuguh!!! & Chutcha / Only ShinDong, KangIn, SungMin, EunHyuk, LeeTeuk, HeeChul).
-
2007 Summer SMTOWN (Suju song to promote: Haengbok / All 13 members minus KyuHyun)
-
Don't Don; The Second Album (songs to promote: Don't Don, Marry U*****
(Repackage Ver.))
-
Don't Don; The Second Album - The Repackage Version. (CD Only & CD+DVD)
-
2007 Winter SMTOWN (Suju song to promote: First Snow*****)
*****: currently promoting.
Super Junior K.R.Y is a sub-unit formed by KyuHyun, Ryeowook & YehSung, the best vocals of the group.
Super Junior T is a sub-unit that sings trot songs and is formed by ShinDong, KangIn, LeeTeuk, SungMin, EunHyuk & HeeChul.
If you get confused....I'M SORRY T_T
You should chek better the English Wikipedia.
http://en.wikipedia.org/wiki/Super_JuniorIt has more info than the other Wiki.