well, exluding Team Twiizer, Waninkoko, WiiPower (because u already mentioned them), here are some of my favourite developers (in no particular order).
I talk to a lot of these devs on a regular basis and consider them friends (or at least as close to being friends as 2 people who have never met can be, lol)
I've put in brackets what they are most known for (off the top of my head, I may be missing apps, but w/e).
-Leathl (show mii wads, customize mii, transmit mii, wad manager multi-mod)
-oggzee, usptactical and gannon (configurable usb loader)
-fig2k4 (wii backup manager)
-Crediar, Daco, phpgeek (preloader/priiloader)
-giantpune (usb loader gx and dop-ios mod)
-wiicrazy (crazy intro, crazy intro video, CRAP)
-da_letter_a (cioscorp and 8-in-1 priiloader hacks)
-nicksasa (blue dump)
-Yossi (categorii)
-cwstjdenobs (bootmii switch, plus a secret new awesome project!)
-WiiGator (cMIOS)
-WB3000 (nus downloader)
thanks to all of u guys!