If you are talking about embedded links in the html generated by sharepoint and sent back to the client browser (in the HTTP response), the easiest way would be to use the Stream Profile (basically a virtual server attribute that allows for fast content replacement. Just specify the search string as "http://" and target string as "https://".
This should replace all references to http:// in your response to https://.
I'd just make sure that there aren't any other references to http content that you don't want replaces (ie, links to style sheets, javascript files, etc). As long as everything points back to your sharepoint site you should be set.
-Joe