I just saw that EMU is shipping a 61 key midi controller. It has aftertouch and appears to be pretty compact and light.
What looks interesting to me is it has 16 programmable buttons. Might be very useful for controlling arranger software. I have noticed that midi controller are more geared towards MOTU and the like. http://www.emu.com/products/product.asp?category=532&subcategory=533&product=15164