May 1st :
Microsoft are issuing an emergency update to address this vulnerability.
See the Security Awareness post for more details
Security Update for Internet Explorer 8 for Windows XP (KB2964358)
Date last published: 5/1/2014
Download size: 3.2 MB
Looks like XP users will still get the MSRT monthly:
Windows Malicious Software Removal Tool - May 2014 (KB890830)
Date last published: 5/13/2014
Download size: 5.7 MB
XP users get MSRT for 12 months, I believe - to April 2015. It's Microsoft's way of saying, you will get infected but we'll condescend to clean up the mess afterwards
Switching from IE to FF or Chrome will help. Most exploits are targeted at 3rd-party applications anyway, so removing Java and disabling Flash is advisable. And malware in PDF files is the current favourite; Chrome has a built-in PDF viewer which may be a bit safer than Adobe Reader.