I'm considering installing the Forestry mod on the Tekkit server, since it was originally a part of Tekkit before it was removed because the author is uptight about people using his stuff or something.
It has some cool stuff in it like automated tree farming, several new engines, beekeeping, new sorts of food, new backpacks, new fuels and sending mail (letters).
Just wanted to know what you guys think about this. Installing it server side isn't a problem, but you also need to install it client side in your Tekkit jar file.
Check out the wiki for more information:
http://forestry.sengir.net/wiki/index.php?action=home