This is primarily a stability fix on the 5.x-2.0 release of Pathauto though it does include some new "features" they were considered to be quite important in order to be added.
This is primarily a security release in response to the token_values potential Cross Site Scripting issue. Pathauto on its own is not affected, but token values provided by Pathauto were not properly checked and may have caused a problem if used by another module (no known examples exist).
Some new bugfixes, some new features, still known bugs (so you may not want to upgrade if you were using 5.x-1.2 and kept with it due to punctuation problems.
This latest version of Pathauto has several new features, but the biggest one is the use of tokens for pattern replacement which should provide greater reliability in the pattern replacement.
Compatability notes
You will now need to use the token module version 5.x-1.8.
Also, Pathauto has improved support for other languages in this release which requires the use of PHP4.4 or higher, or the use of PHP5.1 or higher.
Features/Enhancements:
#118676 by Wim Leers, separate aliasing for forums and forum containers AND a solution to the catpath bug
#141617 by gusgsm1, po file for the Spanish translation of Pathauto 5.1
#125869 provide uid pattern for nodes, by ahoeben
New release for changed features and additional bugfixes. May cause problems, but also may fix some. I hope for this to be generally usable and appreciate testers and people who can provide feedback in the issue queue.
The 1.x branch of Pathauto is the feature complete upgrade of the 4.7 to Drupal5.x
The major point of this 2.x branch of Pathauto is to get rid of old cruft and start implementing the token.module to provide the patterns.
Drupal 5 Compatible 1.0 release of pathauto. This release has a few known bugs (see the pathauto issue queue for details) but is generally at least as stable and functional as the 4.7 version of Pathauto.
I do believe that a 1.1 release will be necessary in the next few weeks so users are encouraged to upgrade to this release, provide feedback in the issue queue for any problems that you may find, and look out for a 1.1 release.
This is the dev release of the 6.x-1.x branch of Pathauto and is fairly "stable." If you are using this you might be better off with the latest "official release" from this branch like 6.x-1.1 or whatever is the most recent official release.
If you want to try out the crazy new code, try 6.x-2.x-dev but reall that's pretty crazy stuff.
