It's been a while since the last release of CodeIgniter, and whilst ExpressionEngine 2.0 is still eagerly anticipated (based on CodeIgniter) the new CodeIgniter 1.7.2 release includes the all new Cart class, which looks very good indeed.

I will be adding support for 1.7.2 into my Google Code project Intype snippets for CodeIgniter, including new entries for the Cart class.