Star Ananda -- the popular Bengali TV channel from Calcutta -- has started an interesting bengali community at their website but the tool that they offer to write in Bengali is rather diffucult to use. I have modified the excellent tool that Deepayan has created on his website and have made it available as a widget that you can embed in your blog.
Since Deepayan's tool is available on available under the terms of the GNU General Public License, version 2, i believe that i am free to use, modify and redistribute it with the provision that it is under the GPL again.
If you want to embed it in your website use this code :
This tool has been used to create the Sonartoree blog as well as to post in the Star Ananda website. It should work well with as long as your machine is unicode compliant.
P.S. For a good collection of free, Unicode compliant, printer friendly Bengali fonts I would like to thank the good folks at Omicronlab.