WordPress.com users now have a feature available to them that should have been in the core of WordPress a long time ago. They call it, Widget Visibility. Users can either hide or show widgets based on category, author, tag, date, or page. This covers the most common use cases without having a need to use conditional tags.
The interface is surprisingly simple. In fact, I prefer what WordPress.com is using versus Widget Logic which requires me to know conditional tags. I’m wondering how did WordPress.com get this feature before stand-alone WordPress? When I asked this question on Twitter, Ian Stewart responded with:
@wptavern I’d look for it here http://jetpack.me/ :)
This makes sense and in fact would allow the Jetpack team to get valuable feedback before ever considering putting it into core. If you can’t wait that long, try out the Widget Context plugin. Widget Context provides a similar interface with a few more bells and whistles that the WordPress.com variety doesn’t have.
The advantage of widget logic (for developers) is that you can write custom boolean functions and then call them from widget logic. I’ve accomplished some pretty nifty things with this approach.