Last night, I released Lab Tick 0.9.3 which fixes a number of small bugs. The biggest change in this release is support for fast user switching. In previous versions of Lab Tick, you either had to disable or quite Lab Tick before you would switch to a different account on your notebook - otherwise, Lab Tick would continue to run and try to control the illumination. This caused erratic behaviour when another instance of Lab Tick was running under a different account.
Also, since Xcode 3.2 in Snow Leopard comes with a static analyzer built-in, I could find a number of small memory leaks, which should hopefully reduce memory usage by a bit.
However, even though Lab Tick 0.9.3 runs perfectly fine on Snow Leopard, it won't run in 64 bit. That is because some of the APIs I use to control the backlit keyboard are not fully 64-bit-capable and have been deprecated by Apple. I will look into replacing those APIs with modern ones that have 64 bit support. Since spare time is always an issue, I cannot make any promises on a release date.
Until then, I hope the lack of support for 64 bit doesn't bother you too much.