Anyway, once you have one of these, you rapidly acquire a big collection of cartridges. The cartridge/tip sets the temperature and will allow the same iron to do everything from 0402 SMT parts to #12 house wire. In my OCD quest to organize and make my board manufacturing side business more efficient, I decided to build a tip rack that would bolt on to the stand. Here it is:
There's room for about a dozen tips, and best of all, they are permanently attached to the base with a couple of 8-32 screws.
Since there are some spare holes now, this probably just means that I'll fill it up.
There's a rather extensive catalog of accessories at the OKI site, including some bizarre SMT rework tips and lots more. These units are $600+ new, but they can be had on the usual auction sites for around 1/2 that in good condition.