I just received my SonnetCrescendo/WSin the mail today. It is a 500 MHz CPU upgrade for Wallstreet PowerBooks (which have 233 to 300 MHz originally).
I installed mine into a 300 MHz model: Before installing the new CPU, whichis as easy as swapping a memory card, one needs to run a application fromthe supplied CD. This apparently prepares the upgrade (performs a ROM copy,perhaps?) but does not appear to add any new extensions to the Systemsoftware as far as Conflict Catcher can tell. I also own a 500 MHz iBook Dual USB and I did some speed comparisons, which turned out to be very surprising.
I use Bose QuietComfort noise-canceling headphones for airplane trips and noticed that the subject of noise-canceling headphones was largely glossed over in your article on headphones. Hearing loss is a very serious issue as all the follow-up on Tinnitus has demonstrated.
OS X’s Mail application uses IMAP to retrieve Mac.com e-mail, which means mail messages are left on the server even AFTER you press delete for up to one month. This means that, without any warning, exceeding the 5 meg allotment on mac.com’s server will thwart any incoming e-mail. Fortunately, Apple has posted instructions for remedying the problem.