First I'll explain the bug that you may encounter with the PDF export and keeping URLs intact.

Above is the sample art I'll be using and export as a PDF file later. I want to add a URL to just the word macromedia at the bottom.

First I select the text I want to add the URL to. Then I go under the Window menu -> Xtras -> URL Editor to make my editor active like shown above.

Under the pull-down menu I choose New and create the new URL. Then while the text is still selected, I click on the new URL to apply it to the text.

Now when you Export to PDF format, go into the Options area to see the setup like above. Make sure you turn on the option to Export URLs.

Now open this PDF in Acrobat Reader. OOPS! Looks like when I place the mouse over where I put the link, it doesn't work. Notice that the pointer is just a "Grabber" Hand, not the telltale"Pointer" Hand.

Well there is a workaround that perhaps many Flash users will be familiar with below.

Going back to the document, add a Rectangle (or any other shape) around the text that you want to add the URL too.

Then set any fills or strokes to None.

Make the URL Editor visible again, and add the link to the selected rectangle.

You see where this is going yet? We are essentially creating an invisible button that will contain the URL rather than the text. You can do pretty much the same thing in Flash to get the same results, as you are very limited to how Flash adds URLs to text.

Now after you Export the file again, open the resulting PDF file again.

As you can see above, the URL is now active and it will take you into your browser when clicked.

You can also edit this URL within the full version of Acrobat to add an outline or to change the URL entirely.