"When you're already too busy, take on something else", could be my motto! I heard it referred to as 'helium arm' syndrome too. You can't help it, your arm just shoots up when a volunteer is needed. (Oh, I need to be needed!)
The latest example of my weakness in this direction is a slight diversion from the norm - I've commited myself to taking part in Dabbled's Make Something Cool Everyday challenge for April. She's been very understanding and it can be MSCNearlyeveryday if you're a bit pushed for time. There are lots of hints and helps on her blog today, and it made me realise that I don't have to produce 30 masterpieces (whew!). I did do that, '30 days hath September, April, June and November' thing, just to make sure how many. 31 might have pushed me over the edge! And I cheated, too, and joined on day 2, shame on me. This little zakka bag was yesterday's effort.
If you would like to join in, or know more about it, click on the box top right (courtesy of Heather of Dollar Store Crafts).