I think the following could help clear up some confusion
What/Where is Metamod: Source?
http://www.sourcemm.net/
(strange feeling that I still might not have this all figured out)
Where does MetaEng fit in? (In simple terms)
MetaEng helps handle various scripting langs for sourcemod... the name won't mean much to server admins and simple scripters, it'll sort of come integrated/packaged with sourcemod... and perhaps other things in the distant future.
Where does SourceMod fit in?
Server admins pick SourceMod-scripts.
SourceMod-scripts plugs into SourceMod
SourceMod plugs into MetaMod:Source
MetaMod:Source plugs into Source Game Server
comparative server trees:
-half-life 1
--metamod(hook)
---amxx
----amxx modules + small scripts
---other metamod plugins
--other hooks that don't want to use metamod(sort of conflicts with others)
-half-life 2
--metamod:source(hook)
---sourcemod (metaeng doesn't show up here?)
----sourcemod scripts of various langs
---other metamod:source plugins
--other hooks(sort of conflicts with others)
--hl2 plugins(?)(conflict? hl1 doesn't have an equiv)
How well do hl2 plugins play along with metamod:source and its plugins?