Other parts possibilities
A gyro chip that can interface with an accelerometer chip and
has on-chip processing with I2C.
http://invensense.com/index.html
Video showing how it works on a cell phone

Video explaining the difference between how accelerometers and gyros work

Quasi open source electronics modules primarily for use with Arduino but might adaptable?:
http://www.liquidware.com/
Just in case, if you're not sure if you've crashed or not, they have a crash test sensor so you can tell just how hard you hit the ground:
http://www.liquidware.com/shop/show/SEN-CTS/Crash+Test+Sensor
From Makershed.com a ArduPilot, an autopilot/nav board, the open source code for it might provide some ideas
http://www.makershed.com/ProductDetails.asp?ProductCode=MKSF4&Show=ExtInfo
has on-chip processing with I2C.
http://invensense.com/index.html
Video showing how it works on a cell phone

Video explaining the difference between how accelerometers and gyros work

Quasi open source electronics modules primarily for use with Arduino but might adaptable?:
http://www.liquidware.com/
Just in case, if you're not sure if you've crashed or not, they have a crash test sensor so you can tell just how hard you hit the ground:
http://www.liquidware.com/shop/show/SEN-CTS/Crash+Test+Sensor
From Makershed.com a ArduPilot, an autopilot/nav board, the open source code for it might provide some ideas
http://www.makershed.com/ProductDetails.asp?ProductCode=MKSF4&Show=ExtInfo
Comments
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Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz