A new website with a good collection of resources to support Journal Club is available at:
Centre for Evidence Based Medicine (at Oxford): www.cebm.net
This site includes a better set of worksheets for the critical appraisal of articles at: worksheets
If you are having difficulty thinking of a topic, I suggest reviewing available questions at:
AAFP Cochrane for Clinicians
AAFP Clinical Inquiries from the Family Physicians Inquiries Network (FPIN)
AFP Journal Club
Hope this helps.