The Wordpress Loop

Im having troubles with the loop again...Im making a category specific page and cant seem to get it right.

<?php $limit = 200; $temp = $wp_query; $wp_query= null;
				$wp_query = new WP_Query();
				while ($wp_query->have_posts()) : $wp_query->the_post();

How do I alter that to only loop category 'news' I can get it to only a category but it dosnet loop more then the first post so obviously the problem was in the while... this was my successful loop as in it... looped lol so just need too know how to refine it more.

Also a question on your product videos and such... do ytou guys care if we link to the stuff you have on youtube so I can save myself some time... for instance in the section explaining marketpress to potential customers can I use the hardwork you guys have done to save me some time, and to give me a marketing advantage in embedded videos lol. If not so be it but figured best to ask either way.