database aliases?

Does anyone know if there's a way to create a database alias? What I'm
after is an easy way to archive older versions of a database (data,
schema, functions, etc) as well as facilitate the dev->stage->production
cycle.

For example, I'd like to be able to name databases like

db-1.0
db-1.1
db-1.2

and have a `db' alias which points to the most recent, while still
allowing users to login directly to a version, e.g., to `db-1.1'.

Thanks,
Reece

--
Reece Hart, Ph.D. rkh(at)gene(dot)com, http://www.gene.com/
Genentech, Inc. 650/225-6133 (voice), -5389 (fax)
Bioinformatics and Protein Engineering
1 DNA Way, MS-93 http://www.in-machina.com/~reece/
South San Francisco, CA 94080-4990 reece(at)in-machina(dot)com, GPG: 0x25EC91A0