Back in February, Motorola unveiled a sliding compatriot to accompany the ultra slim RAZR (which 
has just hit the 50 million sale milestone) and the super thin SLVR. They opted against calling it the SLDR, and rather christened it simply as the Z. Interestingly, they have taken the reverse route that they did with the RAZR: the first release was a black Z slider, but now Motorola has also announced a silver version to join the skinny party as well. Motorola Z slider now available in silver