I came upon this idea on the community site and it looks like it's already implemented. There is the "toram" boot option, that apparently is implemented in Ubuntu already but I've never ever tried it and it doesn't look like it's one of the options that you here of first.
I found this information on boot options at help.ubuntu but no mention of toram:
Anyone tried it?
Anyone seen a tutorial for it?
Edit: Subject changed from( Boot "toram" )