I've been spending quite a bit of time lately with the PubMed Mobile app for Google's Android operating system. This is a great little app that allows you to quickly search the PubMed database so that you can review abstracts and find relevant articles as you're doing your research.
With PubMed Mobile, you can:
Save your search
You can also click a button and open up a mobile web page so that you can view the actual PubMed results page. From there, you can view related citations and navigate to other articles.
To install the PubMed Mobile app, open the Android Market (the app store) and search for "PubMed" and you'll see it pop up.