"MB" wrote in message
Two gadgets that help when ripping:1) ripstrate: A roller device that
sits on the rip fence. It holds the wood down and the angle of the
wheels drives the wood "into" the fence. Wheels only turn i one
direction to prevent launches. A heavy duty and well made device.

They're called Board Buddies.
http://www.grizzly.com/products/G2370

the opposite end of the spectrum is a simple plastic tab, that mounts
inline with the saw blade in a zero clearance insert. It works like a
splitter, but the plastic springyness keeps the woo pushed up against
the fence.

Sounds like you're talking about a Microjig Splitter.
http://www.leevalley.com/wood/page.a...=1,41080,41165