As a geek, I love things like this! Seeing technology combine and produce new systems is fantastic to me. I love it when systems come together in mash-ups like this and produce something neat. Basically this is a script that runs in the Greasemonkey extension for Firefox that automatically looks at titles in your Netflix queue and searches from them on TiVo Central Online. If it finds them, it adds a link next to the title on the Netflix queue so you can have TiVo record it instead. Like so: Then you can drop the title from your queue and get something else.
I picked this up from PVR Wire @ TV Squad.