Apple released a Mac OS X 10.7.1 update on 9/16/11, their first patch for Lion. This small update (17MB) includes a handful of bugs identified before Lion was released, including improved Airport reliability and updated video drivers.
The next major update to Lion, 10.7.2, is currently in beta testing. It is expected to fix dozens of major outstanding issues, in addition to introducing Apple’s new iCloud feature.
One expected fix in the forthcoming Mac OS X 10.7.2 update should be to address the major security loophole discovered with Macs running Lion bound to LDAP servers, where after the user logs in and then back out, subsequent logins can gain access to LDAP protected services by leaving the password blank or entering any username/password combo.
Another expected fixes should address glitchy application and Finder Windows, and the black screen of death (previously posted about on 8/10/11).