This is a cute overview of viruses, with some emphasis on bacteriophage life cycles. It's actually rather good, though has the common problem of forgetting that some viruses bud out of their host cells rather than lyse those cells.

The above video provides a cute contrast between what viruses are and what bacteria are. It does have few issues, though. For one, the idea that viruses don't have biochemical processes is just crazy, instead its that they rely on their host bacteria for often many of those processes, but not all. Another issue earlier on is the drawing of a bacterium in the shape of an amoeba. Best if played at a higher than normal video speed.