AutoDiconnect is a new application by Aymeric Brisse that: automatically closes your idle connections (Wifi + 3G/GPRS + Bluetooth) and switches the network mode of your phone (use 2G when 3G is not required by connection) in order for your batteries to last much longer. It is currently available from Extras.
Faheem Pervez has released another little hack, this time a widget which sits next to the clock in the summary portion of the status bar, showing the quality of your wireless connection: that little 3 in the status area is wifi-signal-applet, which has just landed in extras-devel. It's not pretty and I lack an artistic streak so I had to use text. Designers, please do your thing. Oh and it checks the strength every two seconds. (FWIW, the standard wifi applet checks every 1 second when the status menu is open) It does not check when either the applet is not in view (fullscreen apps, display off, etc.) or if you aren't connected to a network. I will add a [Control Panel Applet] for changing the timeout. Designers are welcome to get stuck in. Since the package is currently in Extras-devel, users should - in general - disable the repository after installing it to prevent unintended upgrades to software in an unstable state.
The autocomplete function in Maemo 5 is handy, but gets polluted with various single use words, typos and so on. Robin Hill has released an editor for the user's dictionary, allowing deletion and addition of terms from the custom auto-complete dictionary. I'm not sure how well this'll handle international character sets, so I'd appreciate some feedback from anyone using those. He also describes the format of the file for other developers interested. The package is currently under development, and the file format has been reverse engineered. Some care is probably called for!