Placed afew adds last night that need reviewing by google first and wondered if they approve them at weekends?
Nope not as far as I know (from both personal experience and multiple forums threads), or they must have changed something, so you'll probably have to wait until Monday/Tuesday ;(
Someone (maybe it was aaron walls at seobook?) suggested that you set up your "borderline" (i.e., experimental) ads on Friday afternoon (PST time) so they are temporarily approved and can run during the weekend unhindered. Then when the next workweek rolls around, the ads are humanly looked at and either approved or disapproved. I can't verify this with personal experience, though. just passing on the info...
i had no idea they didn't approve ads on the weekends, usually my ads go through no matter what day of the week i create a new campaign on. guess you learn something new everyday.. lol oliver
Yesterday, adsense and adwords was closed for a huge "work in progress", probably that could be a possible reason.
It was may experience that the changes to Adwords is on-going, however new accounts may be a different story.