We are working on a live data service for Meteoplug which will allow to send recent weather data in intervals down to every 10 seconds to the Meteoplug server.
Since starting of this week Meteoplug has an option on "Settings" page to get data in that intervals from the Meteoplug client. When your Internet connection can handle this, you are welcome to make use of the switch.
How well data can be handled by the server can be monitored here: http://wiki.meteoplug.com/Server_Status
Sending data in live-like intervals is one side of the equation. Presenting live data with meters and gauges is the other side. Smartbedded (the company behing Meteoplug and Meteohub) recently purchased some meter widgets for SaaS usage from fusioncharts.com.