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We talk a lot about using smartphones to stay productive here at Lifehacker, but those with regular cellphones shouldn't be left out. Weblog MakeUseOf offers a handy guide to keeping up on social networks and staying productive through SMS only.Photo by Jeramy Jannene.

Google Voice may have its own mobile webapp now, but it doesn't provide notifications on your phone when you get new SMS messages. Free web service GVMax solves this problem by putting full SMS support into email and IM on your smartphone.

Google Voice hasn't been in the spotlight much since the iPhone debacle, but Google continues to pack on the features. If you're still not sure what Google Voice has to offer, here's Google's comprehensive Voice guide in video form.

As the outcry over Google Buzz's privacy has shown us, it's smart to explore settings in Gmail, along with other places you're sharing data with the search giant.

We haven't seen any official announcement, but a few eagle-eyed readers pointed out that the Google Voice web interface now allows users to send text messages to multiple recipients.To send multi-recipient SMS, just click the SMS button, start typing in recipients in the Gmail-style auto-complete box, and send away. Nothing much to it beyond that, but it's a great—and much-requested—feature addition. Thanks Joseph and Farhood!

If you find yourself surpassing your cellphone minutes on a monthly basis—or you just like to be careful—free web service OverMyMinutes sends customized email and SMS reminders to help you keep track of your usage and avoid huge phone bills.

iPhone/Palm Pre: Apple and/or AT&T don't want the Google Voice service to have its own iPhone app, and we think that stinks. Google is finally releasing the next best thing: a mobile site that basically replicates a dedicated Google Voice app.

Google Chrome: Google Voice Notifier, one of the 18 extensions we loved at launch, has seen a major update. It now converts phone numbers on the web to automatic dialing links, and initiates calls and text messages from a drop-down box.

Android: The default home screen in Android is fine and mostly functional. SlideScreen, a replacement utility, provides way more information on messages, weather, calendar events, Twitter or RSS streams, stocks, and whatever else you want, in a slick-looking black wrapper.

We've featured one or two Google Voice clients before, but why install another client when you can use one you already have? Free service GVXMPP brings Google Voice support to your IM client of choice, adding SMS-sending power to your desktop.