I was amused by this report in the Daily Mail.  It was first reported in the Northern Echo.  "Website to help unemployed literacy skills littered with spelling mistakes."  (Ironically, that headline is itself ungrammatical.)  The errors were apparently reported in June but by yesterday had not been corrected.  The fact that welfare-to-work companies are careless about such things doesn't mean their clients don't care.  And employers certainly do.
Thanks for all your messages and comments on the first day.  I'd like to respond to some of them.
Eric sent a message saying, "I would say if you send a lot of email applications, have a dedicated email address just for jobs. Use it for updates from sites like jobsite, monster etc.  Dont have an email address thats a bit 'weird' ".  Good idea.
Some good points from Simone (but if you send comments with loads of URLs in them they get filtered out as spam).  You said that you need more than one CV.  But that is the point of having your CV on computer so that you can tweak it for different jobs.  You also said, "If you are an older applicant with good work history then school results are redundant."  Maybe, but you will have to put them on applications forms; and on CVs it depends on the job.  "A" levels might be relevant.  As for your point about filling in application forms in pencil first, I can't agree.  When you write over it in pen it will look messy; and when you try to erase the pencil it will still look messy.  You should have a spare copy to do the draft.  If you make a mistake on the final copy, just cross it through neatly and rewrite - or use Tippex very carefully.
Captain Canal's point about social networking sites is well made.  People tend to forget that what they put on there can be public, so be careful.
We already have comments, so thanks