I Stumbled Across this... careful, it's very fun, IMHO!
http://www.plasmapong.com/For Windows XP/Vista or Mac
Singleplayer:
Left-click = blower
Right-click = vacuum
Mouse U/D = your pong paddle up/down
This supposedly has multi... but the AI is pretty good. And, the soundtrack rocks!
EDIT: It does have multi, but not over the Internet...
Multiplayer:
Player 1 controls:
D = blower
A = vacuum
W/S = paddle up/down
Player 2 controls:
Cursor <- = blower
Cursor -> = vacuum
Cursor U/D = paddle up/down
NOTE: When you use the vacuum, if you capture the pong ball, and then release the vacuum, it sort of 'explodes' and launches the ball very nicely.
Screenshots on maj.com