transactions

I've released an in-development version of PressFlow Transaction for developers interested in convenient encapsulation of SQL transactions. The key features are intelligent use of scope for COMMITs and ROLLBACKs as well as safe, intelligent nesting of transactions to get exception-like semantics.

Usage details are on the project page. Requires PHP 5.

(I posted this to the High-Performance group because encapsulating updates in transactions can dramatically improve performance.)