How to install libraries on a mac?

where do we slap new libraries in 18, on a mac?

Short answer: ~/Documents/Arduino/libraries - create it if it does not exist.

More here: http://arduino.cc/en/Guide/Environment#libraries

And documentation with a specific example for Bitlash here: http://bitlash.net/wiki/install

Cheers,

-br

Cheers billroy!