I was interested in seeing what people's thoughts were on Leopard, have you upgraded, do you plan to upgrade soon (I've heard a few folks say they're waiting for 10.5.2), do you have no plans to upgrade ?

There's a lot of time & code saving features for developers in Leopard, but they're Leopard only. If future versions of SF3, Maildrop, Trapdoor were Leopard only, would that be an issue?