The fastest way to reach me is to send me a direct message on Twitter. If I'm not following you, ping me with a mention to get things started.
You're also welcome to email me at tim at radtastical.com.
Finally, here's my LinkedIn profile.
I work in the Google offices in Mountain View and have already found a favorite internal cafe where I like to host guests.
But meeting outside is also great. I'm big fan of breakfast, and Joanie's (Palo Alto), Hobees, Rick's and Rudy's Can't Fail Cafe (Emeryville) are among my favorites.
I've spent many years informally helping small development teams and individuals build apps, and recently was asked to provide more formal technical mentoring. I'm not able to do as much of that now that I've joined Google, but feel free to contact me if you're interested.