Well, here's a first update on reliable information I have at hand:

The first IYC stamps, a nice pair from Israel that feature the molecular structures of ubiquitin and the ribosome and honor the Israeli scientists that contributed to the elucidation of  their structures and function (and received Nobel Prizes in Chemistry for their achievements), were issued on January 4th, 2011.

Both Belgium and Slovakia issued IYC-themed stamps on January 17, 2011 (see attached photos).  Both stamps show the formulas of water and carbon dioxide, and the selvage of the one from Slovakia includes the IYC logo.

Next is a stamp from France that features a "classic" portrait of Marie Curie in her laboratory, issued on January 17, 2011.

I believe Sri Lanka has also issued a chemistry-related stamp on January 30th, but I have not seen it yet.  Months ago I read somewhere that the plan was for five (!) different stamps, but I don't know how many were actually issued.  Any information to share with everyone at this site would be appreciated.

I got today a jpg of the stamp from Sri Lanka (thanks to Linda Wang from C&E News...).

Here is the link to the Spanish stamp, issued last week

http://www.correos.es/comun/Filatelia/2011/0450_11-seleccionaSello.asp?idSello=2022011&idiom=ENG&idiomaWebActual=ES

I've added to the site high-resolution scans of the stamps from Belgium, Slovakia, Sri Lanka and Spain.  Enjoy.-

Here's also a pretty good image of the Swiss stamp to be issued on March 3rd, and which is already available for purchase at the Swiss Post online philatelic store.

Looks like the next country to issue IYC stamps will be Indonesia, with a pair of stamps due out on March 23rd. Thanks to Linda Wang, Associate Editor of C&E News, for the tip.-

Well, it turns out the the "next" stamp is actually one from Jersey, a British Crown Dependency off the coast of Normandy in France.  The stamp features Marie Curie and is one of four in the "Women of Achievement" set issued TODAY (March 8, 2011).  The other three women on the set are Dame Margot Fonteyn (a notable English ballerina), Florence Nightingale (a celebrated nurse) and Mother Teresa (founder of the Missionaries of Charity in Calcutta).

Thanks for putting this collection together Dan. 

I share your love for postage stamps.  I found the Swiss stamp especially striking. 

Eric Scerri

 http://www.oup.com/us/catalog/general/subject/Chemistry/?view=usa&ci=9780195305739

 

The two stamps from Indonesia were apparently issued ahead of schedule, on March 1.  I'll be posting the corresponding images soon.-

Bosnia and Herzegovina has recently isued a stamp to celebrate the centennial of Marie Curie's Nobel Prize in Chemistry (1911).  However, the stamp makes no mention of the International Year of Chemistry....!  I will also be posting an image shortly.

Take a look at this review publised by C&EN on March 14, 2011: http://pubs.acs.org/cen/newscripts/89/8911newscripts.html

I've uploaded better (i.e., higher resolution) scans of the stamps from France, Switzerland and Jersey.  Still waiting for those from Indonesia & Bosnia and Herzegovina...

I've done a quick search of the websites of several European Postal Authorities that publish their stamp issue plans.  Romania (one stamp, May) and Poland (two stamps, November, in a block) are all that I could find. 

Norway, Estonia and Latvia, Hungary and Belarus don't seem to be covering the International Year of Chemistry. Sweden and Finalnd don't give any information on their future issues - at least, I couldn't find anything.

The Polish stamps ares also linked - liked the Bosnia & Herzegovina and Jersey issues - to the celebration of the 100 year anniversary of the award of the Nobel Prize for Chemistry to Marie Curie.