I almost forgot to mention this one.
On June 15 (tomorrow for me) some Americans abroad are planning a mass call to Congress in support of Residency-Based Taxation (as opposed to the system we have now called Citizenship-Based Taxation aka the reason you must file a tax return in the US even if you live and work abroad .)
If you are unclear about RBT versus CBT have a look at this really nifty summary published by American Citizens Abroad (ACA)
So the idea behind a "Call Storm" is that you and other Americans abroad give your elected representatives in Washington, D.C. a call tomorrow and tell them what you think about CBT versus RBT (and while you're at it you can throw some FATCA fat on the fire). If enough people call then, yes, they sit up and pay attention.
You can find the contact info for your reps here and your senators here.
I am going to keep this post strictly non-partisan and not mention either political party. Certainly you don't have to be affiliated with one or the other to participate.
However, if anyone from either party happens to pass by the Flophouse with helpful information and encouraging words, feel free to post them in the comments section.