Internet usage logs captured during self-directed learning sessions were used to determine how undergraduate medical students used five popular sites to locate and access biomedical resources. Students' perceptions of each site's usefulness and reliability were determined through a survey. Google and Wikipedia were the most frequently used sites despite students rating them as the least reliable of the five sites investigated. The library--the students' primary point of access to online journals--was the least used site, and when using Google less than 40% of pages or resources located by students were from "high" quality sources. Students' use of all sites' search tools was unsophisticated. Despite being avid users of online information and search tools, the students targeted in this study appeared to lack the requisite information-seeking skills to make the most of online resources. Although there is evidence that these skills improved over time, a greater emphasis on information literacy skills training may be required to ensure that graduates are able to locate the best available evidence to support their professional practice.