For preamp pedals a DI can be very usefull, for other types of pedal not so much, it will very much depend on what you are looking to accomplish soundwise. Use one to bypass the preamp on the tatty house rig, go straight to FOH, for recording, use to take the tuner out of the signal chain... it's nice to fall back on sometimes.
Adding to the list:
Harley Benton BDI-2000
Markbass Superbooster
MXR m80
Aguilar Tonehammer
Behringer BDDI
SansAmp(s)
DHA
Sadowsky preamp pedal
EBS Microbass
Hartke Bass Attack
Lehle BassWitch
Eden WTDI
Radial Bassbone
EXAR IB-04 IBEX