This Saturday, the Lied animal shelter is having a low cost microchip and toenail trimming event. I'm a strong believer in microchipping, because without them, I never would have gotten my Pekingese, Toy back in 2005. You can read the original post here. The people at Lied were aware of Toy's story and asked permission to use her as the spokesperson for the event. Naturally, she acquiesed and had a small list of demands (private trailer, constant supply of Chicken Jerky and Pig ears, the usual).
But seriously, if your cat or dog hasn't been chipped yet, go down to Lied this Saturday and get it done. Aside from vacinating, its the best thing you can do for the welfare of your pet. google map