I posted recently about WebGL plot of high resolution AVHRR SST data from NOAA/NCDC. It is 1/4° (about 25 km). I noted that representation of coasts should be improved (it has been). The data is daily, and I showed 21 Dec 2012.
I've now put up a page which I hope to maintain regularly by script. I've uploaded data for many days, going back to at least 1996. I'll continue filling it out. There are selection boxes to let you select the date and resolution, and a button to press to download and display. At top resolution downloading 700 Kb for each plot takes a few seconds.
For the last three years year data is daily, then reverting to weekly and eventually monthly. This will improve.
The globe you will see is a trackball - you can rotate with a mouse and zoom with the right button (vertically). The colors represent anomalies in °C.
Here are some examples of the things that can be seen. Some have noted recently that the seas around Svalbard are fairly ice-free for the time of year. Here is a section from the plot of 7 January 2013, slightly zoomed:
And here is an ENSO study. Here is the cold plume currently in the Equatorial East Pacific, again on 7 Jan 2013:
While here is the long warm El Nino jet from 9 March, 2010:
It's interesting to contrast the Gulf of Mexico temperatures too.
Here is a super El Nino plume from 24 February, 1998: