I find that often my problem isn't lack of idea/premise so much as... I dunno, lack of a starting line, maybe. I'll think over the same general idea for days/weeks/months and never actually get anything about it written down, and then one day I'll have an entirely unrelated idea and get the whole thing written in three hours. I don't know why some ideas come to fruition so easily and some don't, but it's annoying. I'm very fond of some of the ideas that have been shelved in my head for some months now.

But in terms of actual-ideas-I-can-act-on, I've been distinctly lacking for a couple months as well.