gentle intro to suitcase viruses?

[Peter L. Hurd]

Hi, can anyone reccommend a really basic intro to these suitcase viruses?
  Not planning to do science on them, just really interested in them.
Thanks,

-- 
Pete Hurd, hurd at sfu.ca, hurd_p at zoologi.su.se | "If you are working against   |
Behav. Ecol. Res. Grp. Biology SFU Canada    | lowering the birth rate, then |
Etologi, Zoologiska I. Stockholms U. Sweden  | you are automatically working |
 "..& function is the key!" Ian Mackaye &al  | for raising the death rate "  |