WordPress MU

Is there an contact plugin for MU?

you mean something like GPIXEL Contact formular or PXS contact? just a plugin which generates a contact formular you can embed into a wordpress page? if so there are plenty of them, I just listed 2 that came into my mind...

Is this only for WPMU?
If so do you have URL where to find these?

I am a newbee and i dont no if i can use witch one

go here: http://wp-plugins.net/ and do a search for PXS, and another one for GPIXEL .... or just for contact?

I use this one

http://chip.cuccio.us/projects/contact-form-ii/

Works very well indeed.

I use this one, with MU.

http://www.dagondesign.com/articles/secure-form-mailer-plugin-for-wordpress/

I've just made the initial release of this one:
http://blog.clearskys.net/plugins/enquiry-contact-form/

It's not fully tested on Wordpress MU yet, but works on Wordpress 2.x
I'm still writing the documentation for it, but more details can be found at the following locations:
http://blog.clearskys.net/2007/01/16/first-looks-enquiry-contact-plugin/
and
http://blog.clearskys.net/2007/02/16/enquiry-and-contact-plugin-01a/
If anyone tries it on MU and has problems (or not), please let me know

That's very cool but anything that requires theme hacks doesn't roll very well with WPMU - we need backend options for inserting / configuring etc.

http://www.dagondesign.com/articles/secure-form-mailer-plugin-for-wordpress/

Yeh, that's ace - I use it for a couple of my own sites. Does it play nicely with WPMU?

Yes, it does. Although I made a few modifications to it. Mainly so that users couldn't change certain elements of it. Like path to the verification file. I also set it to use a different css path, that call the file from the theme vice the plugin directory.