If File Sharing starts slowly on cold mornings, try deleting the AppleShare PDS file that lives at the root level on each shared volume. Jon Pugh <email@example.com> posted this tip on Info-Mac, saying that it took File Sharing about an hour to start up on his PowerBook, and after deleting the file, it took less than a minute. My Mac always seemed to start slowly as well, so I used ResEdit to make the AppleShare PDS files on all my volumes visible (at which point you can see the snazzy killer rabbit icon), trashed them, and then rebooted. I presume that File Sharing rebuilt them on the subsequent reboot, and File Sharing starts up much faster now. You will lose all your sharing preferences, but since I have nothing fancy set up, it wasn't a problem for me. (I just log in to my SE/30's volumes from the PowerBook as the owner, which allows me to avoid setting up sharing for each individual volume. I once heard that using the Finder's Sharing menu item to share the disks, which lets you share specific folders and set more specific privileges, exacts a small performance hit.)
Enabling Auto Spelling Correction in Snow Leopard
In Snow Leopard, the automatic spelling correction in applications is not usually activated by default. To turn it on, make sure the cursor's insertion point is somewhere where text can be entered, and either choose Edit > Spelling and Grammar > Correct Spelling Automatically or, if the Edit menu's submenu doesn't have what you need, Control-click where you're typing and choose Spelling and Grammar > Correct Spelling Automatically from the contextual menu that appears. The latter approach is particularly likely to be necessary in Safari and other WebKit-based applications, like Mailplane.