PubMed Mobile Pro v1.6.8
Requirements: Android 1.5 and up
Overview: Search PubMed database with over 21 million citations for biomedical articles and life science journals.

More Info:
More features in Pro version:
tap to search an author
tap to search the journal
related citations
Post a comment for an article to public
Write a note to yourself
View public comments for an article
search by PubMed ID, just enter the id in the search box

To migrate your saved articles into the pro version:
install the pro version
start the free version
press menu on the initial screen of the free version
then "Upgrade"

PubMed Mobile Pro v1.6.8