The KML version above is deprecated, but remains to support legacy browsers - if Google Maps can run on your browser, then so will the KML rendering.
For modern browsers with good Javascript performance, try:
UK 48-Hour Notams : Warnings and Restrictions
French (LFXX) 48-Hour Notams : Warnings and Restrictions
German (EDXX) 48-Hour Notams : Warnings and Restrictions
Italian (LIXX) 48-Hour Notams : Warnings and Restrictions
Greek (LGGG) 48-Hour Notams : Warnings and Restrictions
Turkish (LTXX) 48-Hour Notams : Warnings and Restrictions
Irish (EISN) 48-Hour Notams : Warnings and Restrictions
Irish (EISN) 48-Hour Notams : Warnings and Restrictions
Bulgarian (LBSR) 48-Hour Notams : Warnings and Restrictions
Bulgarian (LBSR) 48-Hour Notams : Warnings and Restrictions
Japanese (RJJJ) 48-Hour Notams : Warnings and Restrictions
(Non-EGXX FIRs added as various folk asked for them)
If you want to use the NATS briefing portal, and have maps plotted from briefings generated there, you could try this Google Chrome extension:
UK NOTAM Map Google Chrome Extension
There is also a webapp providing a different presentation aimed at the iPhone and Android handsets here:
UK 48-Hour NOTAMs for iPhone and Android «
If you have an Amazon Kindle, then there is a version of the iPhone webapp (with preferences support trimmed out since the Kindle browser doesn't have the persistence API, but with some additional keyboard accelerators) - point your Kindle browser at the same URL described in the pages above (or use "www.kintam.com" - easier to type on the Kindle keyboard...)