www.pubmed.gov
You can access the web version of NLM by going to
http://www.nlm.nih.gov
PubMed also offers other features for your PDA, including the PubMed search engine itself as well as MD on Tap. MD on Tap is software that searches and finds Medline citations. This can be downloaded from
http://mdot.nlm.nih.gov/proj/mdot/download.php
Medline is a great resource for patient information, since it give great easily understandable summaries of drugs and diseases.
This PubMed software allows you to find what you need in evidenced based medicine without using a computer and without needed other EBM software on your PDA. One downfall is that an internet connection is needed to be able to pull up and read the articles.