After the first email I asked them to stop, after the second I asked again a bit more miffedly (and they promised faithfully to stop sending me stuff too), this is the third spam so I've decided to blog in case others are receiving these emails and wonder about them. Probably the simplest thing is to set up a filter to automatically delete stuff from them. Bit annoying though.
I've also discussed this with them on Twitter so it's particularly annoying to have to revisit this - they asked me what they could do to appear less spammy. My problem with the first email was that it didn't introduce them to me, we started at Level Two with an invite to blog some event or whatever but I need the Level One 'Hello this is why we've started sending you emails', I assume others like this too. So possibly they're not spam, just not very good at engaging with bloggers. Grrr.
Or possibly I am just a bit quick to anger, I do get a bit stroppy with unwanted emails - I'd be the first to admit it.
Edit 14 December 2012
I still appear to be subscribed... albeit via a different (academic) email address that I didn't use to sign up to any of their mailing lists. I give up and will see what JISC/ Janet can do, if anything.
This email has been sent to: [redacted]
WEGO Health | 180 Lincoln St, Fifth Floor | Boston, MA 02111
To opt out of future WEGO Health mailings, please [redacted]