Try Trinity Bars...

http://www.wowinterface.com/download...tyBars2.0.html

I managed my first two MB teams (5 Warlocks and 5 Shamans) without exceeding the built in macro/button limits.
However, my current project is taking 4 existing 70s and building a mixed team to drag up a 5th... to do this, I didn't want to make the existing chars incapable of being played 'solo' so I finally took the plunge and installed Trinity bars, turning off the built-in interface bars when I'm MBing and just using Trinity bars.

Trinity has it's own macroing interface "that allows for an unlimited number of macros up to a length of 1023 characters".

Making bars of any size/shape is very easy.
It's then trivial to put spells, items, macros etc on those buttons.
And it's *so* easy to bind your keys.

It's fantastic... wish I'd tried it months ago... although it did take even longer to set up than Pitbull