Well, I was tempted by all the great comments here, so I ordered some tape and a C4 pad.
I got the tape first and I couldn't believe how much better it made my mouse.
Buy the tape no matter what mousing surface you like. As has been noted, you can't get it anywhere cheaper than CS Hyde.
My C4 arrived the next day. I ordered a larger pad than I had thought, so I actually ended up with enough C4 to apply to both my 3M Precise Mousing Surface and my wife's Dell pad that shipped with her system.
The difference on the 3M was incredible. The 3M pad is designed for ball mice, so it's not the smoothest surface around. The C4 made it much better.
The Dell pad, however, was actually better without the C4, in my opinion.
I was very surprised by this, but I did some very careful scientific testing (I closed my eyes and ran the mouse over the C4 and the regular Dell surface ), and confirmed that I like the Dell pad better.
My wife got cranky when I asked her if we could trade pads, so I bought my own from eBay.
Rockhammer, if you have the time or the inclination, perhaps you can do a quick test between the Dell pad and the C4 WITH the teflon tape on the mouse (you didn't note if you used tape or not, so I assume you used the stock mouse feet), and that way you can tell me if I'm nuts for feeling like the Dell pad is just a touch slicker than the C4. BTW, great review, I enjoyed reading it.
The one and only complaint I have about C4 is that I found the backing pretty hard to remove - if I peeled the slightest bit too quickly, some of the adhesive would come off of the C4 and clump up. This was really hard to get rid of, and the resulting spot would leave a very noticeable bump on the C4. Perhaps instead of the bumpy plastic backing you could use something smooth?
Or you can tell me that I was too darn impatient, and deserve what I got
I'm happy to hear about the Son of C4 project - wish it had been available when I first ordered. I'll keep my eye out and will definitely consider it - especially if Rockhammer determines that I am, in fact, nuts
Last thing - customer service was 100% top notch. I ordered right around the holidays and I got a confirmation e-mail when everything shipped, and even a note apologizing for turnaround time being a little slow due to the holidays - Relax, Sher, everyone deserves a break once in a while!