The Pam Tungsten C has gained two very good in-depth reviews online.
First, we have a great in-depth review from Kenneth Rhee, a long time Sony Cli� user and contributor to his own Palm Corner column at MemoWare. Ken seems to really like the T|C, giving it a 4.8 of 5, with a 0.2% off mainly because of the mono headset jack and lack of built-in microphone.
The other review of note is by Judie Hughes at The Gadgeteer, an always a trusted source for hard-core, well-informed and unbiased reviews. Judie likes the T|C as well, calling the screen one of the best she's seen on a PDA. She also mentions the mono headset, lack of built-in mic and lacking support for Mac users.
I'm really quite excited about the Tungsten C and hope to check one out in person next week, as I travel out to the Palm Developer's Conference in San Francisco, CA. If I'm able to wrangle one and test it out, I'll be sure to post some kind of commentary or review of it here.