We've used Freecycle to get rid of a few items - it's the wife who says put in on - we've got rid of an old microwave and a 10 year old settee within a day or so...phew so much easier than the tip..
As for Dysons - they fall apart.... hence loads get chucked - we cover ours on extended warranty as so many bits have broken and the amount we pay per year is covered by replacement parts... so far 2 x wands, 1x long flexi hose, 2 x foot plate hoses, 1 x foot plate, 1 x whirlwind part, 1 x rear 'framework/pipes' and a new motor.... that's in 3 years.... (we have 2 x messy kids though, so it gets used every day at least twice......)
If you use something like freecycle, and give it a chance, there will always be someone who would like your item..... the local tips are full of TV's - everyone want's a huge LCD telly these days... I'm sure most of those 'old' tellys could have gone to someone 'less well off'...