There are a myriad of useful resources on the web, but finding the right site or the right tool might not be so easy . Below are some sites I visit on a regular basis, that offer a variety of resources and information you will find useful too.
The IRS Website - always a good source of information
Guidestar.org - a useful tool to look up information about your favorite charity. Also look up your charity at Charity Navigator.
State of Washington website with links to other state agencies and departments
The Nonprofit Quarterly - A very useful resource for the tax exempt organization.
The official website for the US Social Security Administration - find out about your retirement benefits, apply for benefits, etc.
A website designed by CPAs to help consumers find tax resources
If you e-file, you can generally expect your refund within 10 - 21 days. Find out what your Refund Status is.