You can write Bangla in Google Chrome installing Automatic Bangla Typing extension I’ve developed! Previously, it had full support for Firefox, but the thing was not working in Google Chrome. Now I’ve fixed some bugs & it’s fully compatible in Google Chrome (16.0.912.77)
If you’re familiar with “Phonetic” layout, you can easily type Bangla.
How to Use
Download the extension from the link above. Then in any website, click a text-field where you want to type Bangla. After that, press Control + Y to start typing Bangla. You can press Control + Y again to switch back to English.