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Here are some simplified formulas I(anlin, bbe) came up with for calculating various parameters of your throw based on a video.

fps = framerate(use the 30fps formula when in doubt).

A list of common framerates:

30fps - NTSC camcorder
25fps - PAL camcorder
15fps - cell phone

Rev rate using the white tape method (result in RPM):

30fps, exact:

(Hours of rotation during 10 frames) * 15

(Hours of rotation during 10 frames) * fps
-------------------------------------------
2

Average ball speed:

frames = how many frames it takes for the ball to reach the headpin after release

30fps, result in mph +-0.01**:

1227
------
frames

Other fps, result in mph, +-0.1**:

41*fps
------
frames

Other fps, result in kph, +-0.15**:

66*fps
------
frames

*)Countries that use the metric system have an range of framerates that vary too much from camcorder to camcorder to use a generic (fixed fps) formula that is possible with NTSC-countries.**) Within a range of 5-50kph or 2-30mph