Today is the deadline to file IRS forms 1040 for personal income taxes, or an extension*. The IRS extended the deadline to April 18th (instead of the 17th) due to system issues that arose on the 17th. So, if you worried that you missed the initial deadline to file, don't worry - its not too late. You have until midnight tonight, April 18, to submit your taxes without penalty.
*Please remember that filing an extension to file is not an extension to pay. You must pay all estimated taxes owed by the filing deadline to avoid failure to pay penalties.