Gotime.com has a set of mobile phone apps that allows you to find a happy hour in many major cities. It works great on my iPhone here in Las Vegas.
Give it a try.
Update
Maybe I spoke too soon… The app seems to have more outdated information than up-to-date information.
For instance, the entry for Fado Irish Pub still shows that it’s located at Green Valley Ranch, while in reality it’s been at its new location for over two years.
Happy hour times are also suspect. Winewench and I met a few couples at P.F. Changs in The District (which is also not listed BTW) for some drinks and appetizers. Afterward we were looking for another happy hour spot, and the app indicated that PT’s Pubs had a happy hour until 8pm. Off we went. We sat down, ordered our drinks, and then found out that happy hour now ends at 7pm.
Now I understand that monitoring the happy hours of thousands of pubs, bars, and clubs is a daunting task, and yes, the app was free, but still…
...And This Is Why We Drink™