Apple has released the necessary Wireless Mouse Software Update 1.0 for both Leopard and Snow Leopard to enable compatibility with its new multi-touch Magic Mouse. However, the devices still aren’t available to buy at retail. The only way to get one is to buy a new iMac, which start at $1199.

If you’re looking to use one of Apple’s new multi-touch Magic Mouse with your current Mac, especially to experience the glory of multi-touch gestures on a desktop, we have some good news and some bad news.

The good news is that the update for Snow Leopard, which requires 10.6.1, and Leopard, which requires 10.5.8, is available now from Apple’s software update downloads site. Software Update didn’t automatically recommend the update, which was posted last night, so it may not recommend the download unless you’re already using a Wireless Apple Mouse (née Mighty Mouse).

Hmmm, where or where can my little mouse be…