Yes but there are a limited number of webparts that can be used with meeting workspaces. I read about this in the book "Microsoft SharePoint 2003 Unleashed", Lynn Langfeld, SAMs, 2004, pages 651 - 652.
Here are the instructions and explanation:
Meeting workspace sites are based on “web part pages” and a web part page has a specific set of web parts associated with a page which is why you are seeing only some of the web parts...
My comment "Now you can access some other list web parts but it is a round about way so if you want to add a Web part for a particular type of list you have to do the following"
Click the “Modify This Workspaces”
Then select “Add Web Parts”
Now click the “”Show All Lists” which will open the Create page
Select the web part list you want to add to the site and go thru the wizard to give it a name, etc. and create it.
When you go back to the meeting workspace home page you will see the new list item.
These are just the web parts such as announcements, lists, events, etc. I did discover that using FrontPage 2003 I can access more web parts but not all and still cannot access MS based web parts such as the Office ones. The restriction makes no sense to me.