You know tablets have officially become a mainstream craze when even the reserved, serious types over at the Financial Times start splashing subsidies around to stimulate their ownership. We've just heard that a $480 purse of gold coins will be extended to any FT workers who decide to purchase an iPad or another tablet between now and the end of June 2011, reportedly in an effort to help the paper's staff become "expert and experienced in using them." We already knew the FT, which happens to have its own iPad and Galaxy Tab apps, saw s