Micro-inverters from Enphase Energy
A small inverter fitted directly to the back of the solar pV panel - one per panel.
Performs Maximum Power Point Tracking (MPPT) on a panel by panel basis, leading to higher overall system efficiency and compensating for panels that might be partially shaded.
Enphase also do a neat little display which shows you solar panel and room thermostat data. It would certainly be a good idea to be able to monitor all your household energy systems from a common display. These devices communicate via Powerline Carrier (PLC).
Perhaps it would be possible to "roll your own" display using the 2.8" colour touch screen shield from NuElectronics.