I have a number of your I2C/SPI backpacks and several different lcds (188, 198, 16x2 RT162-7 (not sure of ada product #))
Starting to dig into them again (as the TFT-Touch is no good on mega - per other thread)
Alas the tutorials have moved and now you have to navigate through several levels of "Tutorial Has Moved" to get to one of the relevant tutorials.
or digging to the I2C tutorial...
http://www.ladyada.net/products/i2cspilcdbackpack/ vs http://learn.adafruit.com/i2c-spi-lcd-backpack
Perhaps this is an in-process move from ladyada.net tutorials to the learn.adafruit.com site?