Solostream 4.0 is a 2-column, fixed-width Wordpress theme built to work with Wordpress versions 2.2 and above. Some specific features built into Solostream 4.0 include:
2. Drop-down navigation for sub-pages.
3. Tag support for Wordpress 2.3.
4. Built-in archives page.
5. Drop-down boxes for categories and monthly archives.
Note: this is not a free theme.
See it here.