There was an article on DD last year about how untidiness at work may be holding you back when it comes to your appraisal. Companies across the UK were asked whether they take the state of employees' desks into consideration as an indicator of wider organisational skills during appraisals.
If you work in London or the SW make sure your desk is pristine.... over half of bosses take the state of your desk into consideration!
http://www.deskdemon.com/pages/uk/career/wantpromotion