I've not heard of the freezing method before ... I would have thought that it would affect the taste of the wine adversely. Do you put the wine into another container or do you leave it in the glass bottle?
Wine preservation after opening is always an interesting topic. I used to use the wine pumps, which would supposedly extract most of the air in the bottle while applying an airtight seal, however from experience, it's not much better than just placing the cork back on the bottle, and not feasible for longer than 1 or 2 days. WineSave looks interesting, and other methods can be quite expensive - i.e.
Eurocave's WineArt preservation system ($595!!).
Generally I now either finish the bottle on the same night as opening, or if I've decanted the bottle, I place the lid on the decanter (both my decanters have lids/stops). Has anyone experimented with different ways to try and preserve wine side by side to see which one is more effective?