A lot of the Cathedral records can be found here
http://www.lan-opc.org.uk/Manchester/Manchester/cathedral/index.htmlIts not complete yet but there are a lot of early baptisms. St. Michaels, Ashton under Lyne can also be found on this site but they have only just started to list them and they are mainly from the 1800's at the moment.
The Tameside Archive centre is the place to see the films of the registers if you live locally, if not you will have to find a Family Research Library belonging to the Morman Church, for a small fee you can order the film of the register and view it for one month in their library, it usually takes about 4 weeks for the film to arrive, if you still need to view it after the month is over, you can extend the time for a small fee. I've done this in the past for a parish register in Derbyshire, there is a library on Patterdale Road, Ashton. The volunteers who staff it are very helpful. If the parish register is on microfiche, the library keeps it so you can view it anytime you want, it only the films that have to be returned.
http://www.familysearch.org/eng/library/FHC/frameset_fhc.aspVanessa