Just received 5 of these.
5Pcs IIC/I2C Serial Interface Board Module For Arduino LCD1602 LCD2004 Display | eBay
Solder them to the 16 pin header on a standard 1602 of 2004 LCD and use I2C to wright to the LCD using only SCL and SCA (A4 & A5 on uno).
Quick test and they work great with the correct library, found here:
http://arduino-info.wikispaces.com/LCD-Blue-I2C#v3
As they are addressable you can have 8 of these connected and still use the same pins for other I2C peripherals.
The ones i bought are just the interface board but they are available pre-soldered to the LCD
Had been put off using serial LCD's in the past as they sometimes use a completely different command set to direct connected LCD's. As far as i can see from a quick test these use exactly the same syntax as a normal LCD and you can even control the backlight (on/off) via software with no extra pins.
Steve