Update on 2/1/2010: iGoogle no longer supports inline gadgets, which includes this module. The alternate OPML export method described by Google Operating System still works however.

The recently released Google Reader homepage module makes it even easier to keep track of feeds on the Google Personalized Homepage. Unlike the built-in feed handling of the homepage, it keeps track of read state, can display item contents inline (in a floating bubble) and takes up much less room. However, if you've been using the homepage's feed modules, moving the feeds to Reader is a tedious process, since the site does not provide an export functionality.

I've created a simple inline module that adds an OPML export feature to the hompage. It does this by going through the DOM, looking for feed modules, and extracting the feed URL from them. It also handles Google News modules, which can be mapped to feeds, but are not quite the same as far as the code goes. To use it, click the "Add to Google" button below:

Once you've gone through the module adding process (and allowed inlining), simply click the "Export OPML" button. This does not work in Internet Explorer, since it does not support data: URIs. Then, do a "Save As..." on the pop-up window and import that OPML file into Google Reader (click "Edit Subscriptions" then "More Actions..." then "Import Subscriptions") or any other feed reader.

This module is not endorsed by Google, and is not guaranteed to always work (especially on non-US Google domains).