Mimichrite seems to be a really fast way to get ender pearls.
- Get the first pearl, duplicate it with Mimichrite until you got 12-13 of them.
- Find a stronghold, go to the end, ignore the dragon
- Build a bridge to about 150 blocks away from the island (or better, use Jet Pack + Angels Block)
- Build a small platform for yourself with a roof on top (2 blocks room, so that endermen can't get in, water on the roof held by microblock strips)
- a pathway 4 or 5 blocks wide, around 25 block long (nothing spawns closer than 25 blocks from you)
- a spawn platform (15x15, 20x20, whatever) connected to the path, pretty much Saice's ender trap linked in the post above.
- Mystcraft books to link your base and the ender farm
It's just insane, how fast they spawn on the platform. If you want to get fancy, put a GeoStrata strength and saturation crystal on the platform. Diamond sword with sharpness and the strength buff means one-hit kills, and you never get hungry while doing it.
On top of endless ender pearls you'll also get ghast tears and emeralds without having to hunt or mine.
If you build a blaze farm (JABBA Diamond Dolly to pick up a spawner in the end), then you've got Eyes of Ender. They are an excellent early fuel source in an Extra Utilities' Ender Generator. (1 Eye = 80 RF for 25 mins, and it takes literally 5 minutes to get a full 64x stack of blaze powder and ender pearls.)