Rev - if you're taping onto a computer, you don't NEED the VxPocket...that's just one option. There are many other devices out there that will let you get an audio signal digitally into your computer. A device like the Edirol UA-5 can act as a preamp and power supply for your mics, and can also output signal via its USB connection to your G4; I use an Esi-Pro U2A which lets me go S/PDIF in, also over USB. Depends on what kind of connections you need, and like Damon said, how much you want to spend for certain features...
--Dave