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This Java-applet (attached) will turn your phone into a vibrator.

Confirmed working on the following models:

Sony-Ericsson
T610, T616, T618, Z600, T630, T62

Nokia
3100, 3200, 3300, 3410, 3510i, 3520, 3560, 3590, 3595, 5100, 6100, 6200, 6220, 6230, 6310i, 6610, 6650, 6800, 6810, 6820, 7200, 7210, 7250, 7250i, 7600, 8910i

Siemens
C55, C56, CT55, C60, C62, M45, M46, M50, MT50, M55, M56, MC60, S45i, SL45i, S55, S56, SL55, SL56

Samsung
X100, E700, E710

Sharp handsets on Vodafone
GX10, GX10i, GX20

Sprint PCS exclusive phones
Samsung A500, Samsung N400, Sanyo 4900, Sanyo 5300, Sanyo 8100, Hitachi P300, LG 3530


I've attached two version of the "Purring Kitty". I think kitty-2 is the latest.[attachment=610] - Kitty
[attachment=611] - Kitty 2

Game console controllers can also be used this way. I don't know of any programs you can download to do this as I opted to write my own on the fly.

Xbox 360 controllers are easily controlled through Microsoft's XNA Framework. The wired ones are the easiest to work with since you don't need to buy an extra wireless receiver.

Wii's Wiimote is also pretty easy to control through wiimotelib. You do need to get a bluetooth dongle to be able to control it. The controller itself is also roughly vibrator shaped, for what that's worth.

I don't have experience programming the PS3 controller, but some Googleing suggests it is possible.