Got a half-finished cup of tea sitting on your desk? Rather than letting it go cold, why not use its milk and sugared heat to power your desk lamp? It's all down to an ingenious device invented by the Scottish clergyman Robert Stirling in 1816. A cup-sized version of his Stirling engine is being sold by gyroscope.com for £45.99.

Want to meet Oz Clarke, the star of Oz and James' Big Wine Adventure, or Tim Atkin, The Observer's wine correspondent? Or have the opportunity to sample 1000s of wines from around the world? Then win one of 10 pairs of tickets for The Wine Show 2007 and get along to the UK’s largest event exclusively devoted to wine.

STOP PRESS: THIS COMPETITION HAS NOW CLOSED - WINNERS ANNOUNCED  

The German winemakers Black Tower are using this week’s ‘biggest-ever wine category review by a supermarket’ to launch their new red Dornfelder Pinot Noir. This light red wine will increase the Black Tower range from the current two whites (Rivaner and Pinot Grigio) and a rosé made from Portugieser and Dornfelder grapes. Among the other 369 new wines on Tesco’s shelves is a white wine from South Africa’s Arniston Bay sold in a resealable 1.5-litre plastic pouch.

Wine writer Malcolm Gluck announced today that he's been forced to concede defeat in his attempts to get his wine-ratings website Superplonk up and running again. In a personal email to Superplonk subscribers, Malcolm explained its loss had been a huge personal blow but didn’t say why his website suddenly stopped working several months ago.