Where many of the counties throughout Texas have nearly-empty websites if they have a website at all Collin County has a robust, detailed, and up to date website which can be hugely beneficial for anyone with an interest in arrest records and warrants for Collin County.
Best of all, you will need only one website for all of the information you require. The best place to begin would be at the home page for the Collin County Sheriff, which is located here: http://www.co.collin.tx.us/sheriff/.
To see if you, or someone you know, has an active arrest warrant in Collin County, simply visit this page and fill out the last name box: http://apps.collincountytx.gov/activewarrants/.
You can see the Top Ten Most Wanted of Collin County here: http://www.co.collin.tx.us/sheriff/tenmost.jsp.
If you are looking for arrest records, you can find a listing of all of the people that are currently in jail in Collin County at this database: http://apps.collincountytx.gov/injail/. Simply click on the name of the offender to be taken to a page which details what they did to get themselves put there.
If you were unable to get the information youre seeking through the Sheriff of Collin County, you should try the Texas DCJ. An official institution of Texas, this group catalogues all of the prisoners in Texas, and you can find their search engine here: http://www.tdcj.state.tx.us/mediasvc/offender_information/index.html.