The timekiller ppa should be ok in near future, it appears he forgot to patch the trusty build.

In the meantime try here, gnote should work to whatever extent it does.

https://launchpad.net/~mc3man/+archive/systray-white

Note it's a global re-enabling, just enable in app's settings if need be. Also there is a unity upgrade in trusty-proposed so at some point this build won't be an upgrade