Once Google Reader added manual controls to its new 'Send To' menu, you knew some delicious URL tweaks would follow. Some already have, including a 'Save as PDF' trick from the Digital Inspiration blog.
If you want to save a Reader feed item as a PDF, email a full blog post to somebody when you only see a partial item, or work more intelligently with social services, Amit Agarwal has your hook-up. Head to Settings in Reader, click the 'Send To' tab, then hit 'Create Custom Link' at the bottom. You'll be asked for a Send To link name, a URL with replacement codes, and an icon location. The link below has all three of those for its tweaks, including one that creatively uses the previously mentioned PDF Online converter.
We are, of course, open to your own suggestions and codes that extend Google Reader through this neat little open door. Share the links and URLs in the comments, and we'll possibly pick them up for a meatier post down the line.