IssueTracker

The link created by app.createAnchor() is prepended to 'http://www.google.com/url?sa=D&q='
So,
app.createAnchor('Click here', 'http://dhaatu.com?p1=v1&p2=v2') actually links to

http://www.google.com/url?sa=D&q=http://dhaatu.com?p1=v1&p2=v2

This causes a problem in some browsers (Firefox, IE and older versions of Chrome).
What happens is Firefox and IE open up a new tab with a redirect notice asking for user confirmation before proceeding and in the process, they miss out p2=v2 (see the link above)

Here is the redirect notice verbatim

" Redirect Notice
 The previous page is sending you to http://dhaatu.com?p1=v1 

 If you do not want to visit that page, you can return to the previous page.
"

If you observe, the redirect notice has omitted the 'p2=v2' part.
This can cause problems.

The issue is two fold.
1) The link created by createAnchor() does not take you straight to the intended target
2) The redirect notice being shown up is also annoying

The third problem, which is that of omitting the last part of the URL may be browser specific but I'm not 100% sure.