353 libraries plus 26 mobiles currently under threat or recently closed (List below “News”)
Being the list below represents around a third of  authorities in the UK, the final figure could be from 800 to 1000.

News

The BookSellers Association swung their support behind libraries today amid fears that there are only six weeks to save public libraries.  With up to 1000 going in 2011 and further funding cuts inevitable in the next three years after, there is a real possibility that only a rump of the current 4500 libraries could still be open by the time of the next General Election.  Also, council decisions are made in February … hence just six weeks to act (and there’s Christmas inbetween).  No pressure there then. Finally, Ed Vaizey also appears to have reinterpreted the 1964 Act.

Conwy – small libraries to go, protests begin – North Wales Weekly News
Croydon – libraries to be run by volunteers or to be moved into schools or closed – This is Croydon
Flintshire – petition launched to protect Queensferry – Flintshire Chronicle
Gloucestershire – Alison Weir says cuts are “cultural madness” – FoGL
Gloucestershire – Librarians being bullied – Alan Gibbons
Hounslow – cut in hours, possible closures, £869k p.a cut – Hounslow Chronicle
Islington – could be a trust? could merge? – Alan Gibbons
Kirklees – worry over library cuts – Mirfield Reporter
Leeds: Councillors agree to 10 week consultation – Guardian
London: 1 borough no closures, all the others no guarantees – Guardian
Merton – 2 libraries to have reduced hours – This local london
Oxfordshire – library is a lifeline – Oxford Mail
Oxfordshire – e-petition to save libraries – Oxfordshire Council
Southwest – Lib Dems complain at draconian cuts – London Editor
Somerset – Consultation period only until 14th January – BookSeller
Somerset – “shameful” cuts, says authors – Alan Gibbons

Are local libraries still relevant? – 88.7% say yes at close of poll  – Guardian
Defining our professional future – CILIP
Ed Vaizey – narrow definition of “efficient” enrages campaigners – BookSeller
Libraries of the future – Culture Vulture
Six weeks to save the library sector – BookSeller

USA – Museums and Libraries Act passed – Library Journal