The answer can be simple or a little more advanced, depending on how you solve it:

1.#openinnewwindow

 To add #openinnewwindow to the end of the URL is a common suggestion, but it doesn’t work unless you make some JavaScript modifications.

2. Summary Links Web Part

Using MOSS, you say? Well, let the Summary Links Web Part come to the rescue. This web part is included in MOSS. Add this web part to a page and you can easily customze the links.

The drawback is that you add and edit the links in the web parts itself, it’s not connected to a list – not the Sharepoint way to do it if you ask me. You’ll have to have Design or Contribute permissions to add links that everyone can see.

3. Convert to XSLT Data View

OK, you only have WSS but you have Sharepoint Designer? Well, just open the page where you have a web part showing links from you links list in Sharepoint Designer.

Right-click – Convert to XSLT Data View.

Now you can right-click a link and set the target to a new window.

Right-click and choose Hyperlink Properties:

Click Target Frame:

Choose New Window:

That’s it! You can also set this as page default if you like.