java
sql
iphone
css
xml
ajax
python
mysql
android
ruby-on-rails
regex
objective-c
eclipse
silverlight
json
perl
algorithm
delphi
api
jsp
Though there would be no forum solely for widget dev, you can submit your inquiry on bada development to bada Developers website.
It has forums also, supporting English, Chinese, Korean and Russian. http://developer.bada.com/badaforum/category/list.do?categoryId=21&menu=MC01050900