Just upgraded from 1.5.2 to 2.0 (1.6):
WordPress database error: [Table 'aarvan01_wrdp1.wp_usermeta' doesn't exist]
SELECT meta_key, meta_value FROM wp_usermeta WHERE user_id = '1'
This is the error message I get when I view my blog or when I try to sign in to the wp-admin page.
I tried editing the new wp-config-sample file (and renaming it obviously), no change.