This 2 arm study will evaluate the efficacy and safety of oral Valcyte compared with intravenous ganciclovir for the treatment of CMV disease in solid organ transplant recipients. Eligible patients will be randomized to receive either 1)Valcyte 900mg po bid or 2)ganciclovir 5mg/kg iv bid. The anticipated time on study treatment is 1-2 years and the target sample size is 100-500 individuals.