Redirect is a bit of a bugger, because it uses the requested url to create a new one. So it really depends on what you want, and I'm not 100% sure about that, so I'll tell you both ways of doing it.
If the structure of your site on the new server is the same as the old server, and you want to redirect request to the files new location, you can use Redirect. The trailing slash *shouldn't* matter, because most webservers automatically rewrite urls with it if they can't find a file of that name, but you should add it anyway just in case:
Redirect / http://newserver.com/
You can also use mod_rewrite to do it, like this:
RewriteEngine on
RewriteRule ^/(.*)$ http://newserver.com/$1
However, if the structure of the new site *isn't* the same, or even if it is and you want all urls on the old server redirected to one url on the new one, you'll have to use mod_rewrite, like this:
RewriteEngine on
RewriteRule ^/.* http://newserver.com
or:
RewriteEngine on
RewriteRule ^/.* http://newserver.com/someurl.html
The trailing slash definetly isn't important on the last one there.
Of course using mod_rewrite is dependant on the module being compiled into the server, but if it isn't, it should be!
Be warned, my regular expressions aren't the best in the world, so they mightn't be 100% accurate, but they should be. If you have any problems, just post here again and I'll do my best to correct any errors.
Cheers,
adam