John Gruber is keeping an incremental list of unpromoted Tiger features—and mis-features, a must-read-and-revisit for all Tiger adopters.

For instance: StuffIt Expander, the file archive program for Mac, used to be included with Mac OS X. With Tiger, it is not. There are still quite a few ".sit" files around, which require StuffIt Expander to unbundle. StuffIt includes a registration roadblock (valid e-mail address required, guh) and confusing "free trial" language, but you end up with a free (non-trial) version of the Expander, which is all you need.