<p>We are planning to use the jQuery library to augment our client side JavaScript needs. </p>

<p>Are there any major issues in trying to use both ASP.Net AJAX and jQuery? Both libraries seem to use $ for special purposes. Are there any conflicts that we need to be aware of? </p>

<p>We also use Telerik controls that use ASP.Net AJAX.</p>

<p>TIA</p>

jQuery has a noConflict() method as a part of the core, but it then requires that you either use jQuery as your named function or something else of your choosing (instead of the dollar selector). However, I will say that the method is often dependent on the implementation of the "competing" library. I have tried to use it for a Ning social network (which used Dojo), and for Magento (which uses Prototype), and I could not get either to play right with jQuery. This is just my personal experience, and others have been very successful.
http://docs.jquery.com/Core/jQuery.noConflict