The only working version of kcheckgmail is 0.5.5, which has been in ~arch since November 2005. It should be marked stable. All of its dependencies are stable.
Never touched this application, but it there wasn't any bug filed, so I suppose it should be fine to be marked stable.
x86 stable
The threads menu in the panel icon is totally h0rk3d. It shows lots of span attributes and HTML escaping. Appropriate bug report here: http://sourceforge.net/tracker/index.php?func=detail&aid=1464439&group_id=116095&atid=673717
This seems to be a bit crash-happy on SPARC at the moment. When I get a chance to look into it more, I'll update here.
Seems OK on amd64 - marked stable.
doesn't seem to work for me. I think gmail recently made some changes to their authentication.
We'll just leave it at ~sparc.