Studies suggest that patients retain somewhere between 14-50% of what they are told by their providers (see references below). Giving patients an authoritative site that they either write down or take a picture of on the white board I use makes it easier for them to recall what I said and further research information later. On their followup appointment they can ask further clarification with complicated issues or if it's something easy, they can email me with their question. Since 80% of internet users are searching for healthcare information I am happy to supply them with accurate sources.
Kessels RPC (2003). Patients’ memory for medical information. J Roy Soc Med 96:219-222.http://www.webcitation.org/query?url=http%3A%2F%2Fjrsm.rsmjournals.com%2Fcontent%2F96%2F5%2F219.full.pdf%2Bhtml&date=2012-06-03
Jansen, et al (2008). Does Age Really Matter? Recall of Information Presented to Newly Referred Patients With Cancer. J Clin Onc http://www.webcitation.org/query?url=http%3A%2F%2Fjco.ascopubs.org%2Fcontent%2F26%2F33%2F5450.full&date=2012-06-03
J R Soc Med. 2003 May; 96(5): 219-222. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC539473/