OK, I understand that they're different, but are both still current?

A buddy has an Intense Tracer which has tabs (assume for Hammerschmitt duties), bought an ISCG mount stinger/roller thingy, it doesn't fit. Does this mean he needs ISCG 05? Intense website mentions nothing at all about tabs on a Tracer, but the Tazer 4X frame has ISCG 05 tabs.

Yeh, he'll need 05 tabs. 05 tabs are a bit bigger and the holes are at a slightly different position. Theres some info about it on the e13 site i think.

God knows why theres two standards though

ISCG 05 is the newest 'standard' so most if not all new frames should be 05.

Thanks!