Best Weather Websites or Apps??

Like John I use a version of the 7timer on the iPhone using the Skyharbinger app. The YR.no site is liked by many outdoor folks and has a very good reputation. Being a Sea Kayaker I also find the Windguru is quite useful and accurate even for observing.
Donal

Thanks all- they're great, used them all last night, unfortunately they didn't keep the clouds away! Someone needs to invent an app for that