Sometimes a picture is helpful...
I looked around and Raidzero actually has a picture of all three in his ROM thread (I hope he doesn't mind me linking it)
http://forum.ppcgeeks.com/showthread.php?t=99037
I believe:
Picture 1 is Manilla 2.5 (also known as Sense UI)
Picture 2 is Manilla 2.1
Picture 5 is Titanium
(Titanium is usually in most 6.5 ROMS whether it has Manilla installed or not. So you can actually switch back between Manilla and Titanium if you so choose.)