I have a second blog installed that uses the same post table, but different options. This gives me the ability to preview a theme before putting it live.
In WP 2.5.* I had it running thanks to a good blog post, but in WP 2.6.* the method has changed. The way WP determines prefixes and arrays is different.
Has anyone figured out how to use 1 database for 2 installs, but only have the options table different? I know it basically means changing the prefix for all tables except the option table, and this is throwing me off.