Wordpress Recovery from Failed v2.7.1 Upgrade

Decided to upgrade Wordpress this morning from v2.7 to the latest 2.7.1 for all the bugfixes and patched up potential XSS vulnerabilities. Thought I'd try using the new built-in automatic upgrading feature via the browser but, that was when things went pear-shaped. A browser time-out error occurred during the upgrade and the...