OSGI pluggability in Sling

[Glenn Silverman]

As a Sling novice, I would like to know if the OSGI implementation in 
Sling is really pluggable, as the documentation suggests?
If so, is there a how-to document, or an example, of using Equinox in 
place of Felix.
How about running Sling and Jackrabbit, without Felix, in Spring DM?
Glenn Silverman...