For my part I wrote a node.js server application that acts as a notification central: myhub (https://github.com/PaulFreund/myhub).
It captures events from different sources (xmpp, irc, mail, rss) and makes them accessible via Email summarys, RSS feeds or a webinterface which is only implemented for a Kindle interface right now.
That way I get a mail every five minutes if I got messages and my phone will notify me about that.