Apple today released the OS X 10.7.3 update for the client and server versions of Lion - unlike 10.7.2, which introduced a major feature in iCloud, the 10.7.3 update consists mostly of smaller feature and security bugfixes. The updates are currently available both from Apple\'s download site and from Software Update - its build number is 11D50 and it bumps the OS X kernel version to 11.3.0.
On the client side of things, 10.7.3 adds Catalan, Croatian, Greek, Hebrew, Romanian, Slovak, Thai, and Ukranian language support, and addresses problems logging on using smart cards, with Windows filesharing, and with printing Word documents that use markup. Older iMacs with ATI graphics cards should no longer experience performance issues after waking from sleep, and post-sleep wi-fi connection issues were also addressed. Safari should no longer have trouble opening before the computer has connected to a wireless network. Lastly, Apple has fixed an issue authenticating to distributed SMB shares, and RAW image compatibility with additional cameras has been added.
Enterprise users with Active Directory domains should also note that the 10.7.3 update fixes a number of Directory Services bugs, a full list of which can be found in the client release notes.
OS X Server sees a few more feature updates, both in Server.app and in the services themselves - there are too many of them to list here, but you can check out the server release notes for a full list.
10.7.3 also includes Safari 5.1.3, a minor version bump for which release notes are not currently available (it\'s also not clear whether 5.1.3 will be released to Snow Leopard users, or whether it addresses issues that are only present in Lion). Snow Leopard users can also grab Security Update 2012-001 to get all of the security fixes present in 10.7.3 that also apply to 10.6.8.