I have wordpress and I want to set up a twitterfeed to a certain category on my site. But not all categories.....is there a way to do this?
You can get an autoblog plug in and import what ever you want. There is no way to import a twitter feed or any other without it.
My first recommendation is that you not use your posts for Tweets. It's a waste of resources. If you want to show Tweets, you can use one of many Twitter plug ins or scripts that you can place in your sidebar. There are many for Wordpress, just look through the plug in repository or search "Wordpress, Twitter widgets". There are also Twitter scripts at Twitter.com that can be placed in text widgets for your sidebar as well. If you are set on feeding Tweets as posts, you will have to get an Autoblog plug in. It will require that you investigate which one has the options that you want. Again, you can search "Wordpress Autoblog Plug ins" and get a whole list of them.