This has already made the rounds on all of the usual sites, but if you haven't seen it yet, I urge you to check out the new Spectrum Analyzer posted on Wendy Dunham's site.
I did something a little similar in Patch A Day's early days with the Visual EQ patches, but my goal with those patches was to provide EQ and visual feedback in the same Combinator. Wendy's patch, put together with help from fellow Reason users Rogerraa and Selig, is simply concerned with frequency analysis. And, although its scope is a bit limited, the extremely clever way its put together makes it an essential tool for any Reason user.
What makes it so clever? It seems pretty obvious now, but Wendy put the frequency bands into the Combinator backdrop, giving a quick, visual reference to the bands displayed in the BV512 beneath it. Being able to see that a troublesome peak is hitting between 76 Hz and 104 Hz makes EQing it much easier than the usual trial and error that I find myself performing to tame something that's gotten out of control. With the Spectrum Analyzer Combinator, I can quickly zoom in on a problem frequency range and spend more time fine tuning it, than trying to find it.
Really well done, Wendy, Rogerraa and Selig!