The ado-mode is a major [editing] mode for Emacs which allows truly good editing of Stata, namely do, ado, sthlp, smcl, and mata files. Here is a screenshot to see what the highlighting does. The mode also handles indentation, date stamps, and includes templates for writing help files, project do-files and the like.
Here is the change log which says what is new.
The current version is 1.12.0.1, which is made for Stata 12. It works just fine with earlier versions of Stata, but it will highlight commands as though you were using Stata 12.
Here are the things which make life easier when using the ado-mode.
ado-mode can communicate well with Stata itself, sending code directly to Stata for evaluation. This works for both Mac OS X and MS Windows. It does not yet work for any non-Mac-OS-X unix. For an explanation of the settings (along with hints for how to port it), please look here.if, foreach, forvalues, and while blocks get closed. Many types of indentation styles are supported.smcl directives are correctly highlighted, which saves time when writing help files.The zipped current version can be obtained by clicking here.
Anyways, here are the installation instructions.
Please let me know if there are any troubles with the installations, since there are little quirks with cross-platform Emacs stuff.
ado-mode is on Twitter: @ado-mode. The real reason for this is to have an easy RSS feed for finding out about updates: http://twitter.com/statuses/user_timeline/106578815.rss
If you are curious about Emacs, here is some more info. It is very dated, but it conveys the feeling well. If you are sold, and want to get a copy, here are more instructions.
If you are intrigued about using editors for editing Stata code in a nicer way than the built-in do-file editor works, try checking out the unofficial FAQ on text editors and Stata.