How to embed the "Include View as Web Page" generated URL into the email content?

I believe the following will allow you to do this.

<p align="center"><span style="font-family: Arial; font-size: xx-small;"><span style="color: #666767;">If you are having trouble reading this email</span>, <a href="http://ww2.[your domain].com/index.php/email/emailWebview?mkt_tok=##MKT_TOK##"><span style="color: #666767;">read the online version</span></a>.</span></p>

Elliot's right; here's a cleaner version of just the actual address:

http://**your Marketo CNAME**/index.php/email/emailWebview?mkt_tok=##MKT_TOK##

If you look in your Admin section under Email, all of the code is available to you there. 

Many thanks for the responses. 

FYI....I had been using Elliott's snippet in my emails.  All of the sudden, (maybe with the newest release?), our "view as web page" stopped working.  I plugged in Jason's snippet, and it worked fine again.  Thought I'd share in case anyone else is having the same issue.