One good thing to come out of the recent synod was a new online mental health resource called Mental Health Matters. Echurch blog has a helpful summary of what's on the site, and it looks good. In a brief browse I came across papers on mental health and the healing ministry, and examples of local engagement with mental health, overcoming the stigma of mental illness etc.
Also worth a look is Mind and Soul, which has regular conferences, and there is lots of helpful stuff on there. I was most interested in a course they've developed 'Living Life to the Full With God', a course for those with anxiety and depression, which can be run locally or online. There seem to be an increasing number of nationally produced, locally deliverable courses available to churches, but this is the first one I've come across that deals with Mental Health. Holy Trinity Brompton have a 'dealing with depression' course, but as far as I know that's not available as a resource pack for other churches.