Thanks for wrapping that up (+1) - a couple of recent topics are missing though, so here are 
More Common Questions
-

**Why is there no stable sort order for `/sites`?**

See [How to order /sites result in a user friendly way to use it in our apps.][1] for comments, discussion and workarounds.

**Why is the site creation date not available?**

See [Can we add a creation_date to the /sites method?][2] for discussion and workarounds.

**Are there any high resolution/scalable (SVG) icons or images available?**

Right now there are SVG versions available for the non Stack Exchange 2.0 sites only, see the [respective question][3]. Others will likely be added over time once the respective communities haven agreed on something (see [area51 + logo][4] for more questions regarding this eventually).

**Why are the SVG versions not hosted officially and linked via `/sites` too?**

The [respective feature-request][5] has not been acknowledged so far by the Stack Exchange team.

----

For reference and transparency here are links related to questions already included in 
Common Questions
-
**Why not return a site_key or similar?**

See the declined feature-request [please add a key fields to stackauth results][6] for a discussion.

**How often should I query for new sites?**

See the deferred feature-request [Why does the API lack (proper) HTTP cache control headers?][7] for a related discussion.


  [1]: http://stackapps.com/questions/1203/how-to-order-sites-result-in-a-user-friendly-way-to-use-it-in-our-apps
  [2]: http://stackapps.com/questions/1181/can-we-add-a-creation-date-to-the-sites-method
  [3]: http://stackapps.com/questions/95/are-there-any-high-resolution-scalable-svg-icons-or-images-available
  [4]: http://meta.stackoverflow.com/search?q=area51+logo
  [5]: http://stackapps.com/questions/966/link-to-svg-logo-on-stackauth
  [6]: http://stackapps.com/questions/739/please-add-a-key-fields-to-stackauth-results
  [7]: http://stackapps.com/questions/1028/why-does-the-api-lack-proper-http-cache-control-headers