Yeah, that's the same type of gizmo I'm using here, except mine is from SparkFun: »www.sparkfun.com/products/8745
Edit: But I like the one you posted the link for even better. Gotta get some!
Handy little sucker. I'm actually using the "LV" (Low Voltage) side to POWER the flash chip in-circuit inside the modem. Works rather well!
After disconnecting the logic analyzer, the loading on the pins is now low enough that I'm getting very consistent error-free dumps every time. Takes just under 19 minutes to dump all of flash in ASCII-hex (with spaces) over the serial link. I can speed that up by eliminating the spaces between byte values, which ought reduce the time by 1/3 or so.
At this point, I'm just about ready to borrow a modem with 02.16 firmware to read the image out of.