Apple has updated and released a few troubleshooting-based knowledgebase articles, which cover a few recommendations and current problems that people are experiencing in OS 10.5 and 10.6, including keyboard issues on MacBooks, the use of home directories on FAT32 volumes, and keychain issues at login.
This article outlines a quick recommendation to keep your router or modem's firmware up to date, which should help keep the router working with the latest networking technologies in the OS. Most routers have a built-in updater, which can be used to update the devices.
One popular modification to OS X is moving one's home directory to a secondary hard drive, which can help sequester personal data from shared resources such as system software and applications. Nothing prevents you from using formats other than the recommended HFS+ format for this; however, if you use FAT32 there are a few things to be aware of.
This article outlines a couple of problems experienced with MacBook computers where keyboards will periodically not respond or miss the first key being pressed which can be addressed by applying one of two updaters.
This article covers a situation where the login keychain cannot be unlocked, and the system provides three option: Continue Login, Create New Keychain, and Update Keychain Password.