Thought I'd throw my own results in here, even though I've only got 2 cards the same speed and one 7D body.

70-300L, 70mm, f/5.6, iso100, 1/125s, pointed at a white wall. TC-80N3 set to 20s-long 'bulb', but camera set to HSC. Fully charged battery, cards formatted in-camera. Firmware 1.2.3.
ALO off, PIC off, all noise reductions off. I didn't time the length of the "busy" light or the red "write"-light afterwards

8GB Sandisk Extreme 60MB/s card, RAW-only: 68 frames, 1.2GB (1,304,866,608 bytes).
16GB Sandisk Extreme 60MB/s card, RAW-only: 69 frames, 1.2GB (1,324,110,624 bytes).
a) that's a good result, because I bought my 16GB card in hong kong for the same price as the 8 in Holland (ie, it's genuine or at least a good-speed ripoff).
b) Not sure why the 8GB missed its last frame, maybe because I forgot to format it but did format the 16GB?
c) viewfinder says 16 images possible, but I get 22 before the slowdown to bursts-of-2 roughly every second.
d) 18MB per .CR2 file.

8GB card, RAW+LJPG: 56 frames, 1,240,964,468 bytes.
16GB card, RAW+LJPG: 57 frames, 1,262,978,180 bytes.
a) again the 16GB gets one more frame in (both formatted in-camera pre-test this time).
b) viewfinder says 6 possible shots, but I get 8 before the slowdown.
c) I always thought that the jpg-processing overhead wasn't much, seems I lose ~60MB over a 20 second burst, ~3MB/s slower.
d) 18MB CR2, 3MB JPG or so.

8GB card, LJPG-only: 153 frames, 435,550,489 bytes.
16GB card, LJPG-only: 153 frames, 429,442,384 bytes.
a) size difference was about 2 JPGs-worth, but same amount of frames.
b) Viewfinder said 96 shots available, but absolutely no slowdown in 20 seconds. Should i add more to my shutter-count to see how many JPGs I can get before a slowdown?
c) 2.7MB per JPG or so.

For the hell of it, I found an old 512MB "Pretec 80x" card that i've been using as an IDE drive in a firewall (built from an old pentium 1 using ipcop) for a few years and recently upgraded.
RAW: 20 frames or so, then 2 second wait, frame, 2 seconds, frame, 5 seconds, frame, then Full CF (maybe missed out on one frame in the end). 25 frames, 476,331,819 bytes.
RAW+JPG: still get 8 frames before the slowdown, then a few bursts of 1 or 2, a 5-second wait, 1 shot, a 5 second wait, then the 20-seconds is up. The "writing" led doesn't go out for about a minute or two afterwards, I thought I'd broken my camera. 20 frames in total, 440,834,628 bytes.
JPG: 13-seconds before a slowdown, then a few bursts of 1 or 2 frames each. 113 frames, 315,670,763 bytes.

The results for the crap-card are interesting in that you get an idea of the performance of the buffer. ie, I still got nearly the same number of frames before the slowdown in all but LJPG, but once the slowdown started, the camera's nearly unusable for 2 minutes.