There are lots of samples in liferay  website to download for portlet  development including Sample Struts Liferay which shows you how to use Liferay's struts bridge, If you have any problem to use it as the base of your portlet I can help you. Refer to

www.liferay.com/.../11995?_98_redirect=%2Fweb%2Fguest%2Fdownloads%2Fofficial_plugins%2Fsoftware_catalog%2Fproducts%3F_98_type%3D%26_98_keywords%3D%26_98_advancedSearch%3Dfalse%26_98_andOperator%3Dtrue%26cur%3D2&

You can also search for any kind of portlet or plugin here:
http://www.liferay.com/web/guest/downloads/official_plugins

Please do not ask for individual helps and let everybody joined this forum use the topics. However there is no sign in this forum from the senders of the problem that they achieve their answer or not ;)