I got an invite, to my google apps domain account. Can't use it.

I thought profiles are now enabled on Google Apps -- or do you mean your domain manager won't turn on the profiles?

Profiles are not available for Google Aps.

Yes you can, copy the link, sign out of apps, sign into your gmail account, then paste the link and go.

I don't think invites are tied to specific email addresses?

They are. I attempted to use the signup invite link given on a different account, it failed.

Interesting, I was definitely able to use a different account for my invite link. My original email was also tied to a Google Apps account with a custom domain. I can't seem to find the option to enable profiles in Google Apps, so I ended up registering with an old gmail account.

They aren't. I got an invite on my epochwolf gmail account but signed up with my personal gmail account. (Which I happened to be logged in to at the time)

So you went from @gmail to @gmail? Not Apps domain to @gmail

I went from Apps domain to gmail and it worked fine.

Correct.

Might have been a generic failure due to a signup rate limiting. Maybe it's worth retrying for a couple of time.

I just got it sent to my @gmail