IWBNI, we could link to Artist:<mbid> Track:<mbid> or Release:<mbid> from within annotations or edit notes, and get something along the lines of http://test.musicbrainz.org/images/entity/artist_small.gif <Artist Name>, http://test.musicbrainz.org/images/entity/track_small.gif <Track Name>, or http://test.musicbrainz.org/images/entity/release_small.gif <Release Name>.
Personally I think it would be better to start without the image and just display a text link, then later on see if the image is needed.
This should use the same link formatting style as the wiki, like
to keep consistency, if possible.
If we could avoid the use of superfluous double [] and use simple  instead, so that it's the same as the current edit note syntax [ArtistCredit].
edit 2012-07-25 or even better use markdown (OTHER-77) everywhere.
I think the aim of this is typiing the minimum keys as possible, so I propose that the simple "artist:88d8f38f-adb4-48a0-8c1f-ec34f2a675ff" (without quotes) would be auto-rendered as "陰陽座" (without the quotes, ha ha).
edit 2012-07-25 entity icons + shorten and embelish MB links does, among other things :
hmm, this is all to much work for me... I have to copy the URL, manually strip everything than the MBID, and add "artist:". How about if the parser would just display MBID URLs in a nicer way?
http://musicbrainz.org/artist/b10bbbfc-cf9e-42e0-be17-e2c3e1d2600d would just become The Beatles. It would be very easy to extend the parser to allow the old ".html" suffix or an optional "www." subdomain (or https).
This way I can just hit "copy link url" and paste it, and it is displayed nicely. It is backwards compatible for all the URLs in edit notes / annotations!
I really like the hrglgrmpf's idea. In plain-text copying the URL is the easiest for editors.
+1 for this, particularly hrglgrmpf's comment.