The synch on my Android phone (Motorola Droid) was running CONSTANTLY… slowing down everything to a crawl! I finally just now went in to my sync settings and discovered what was syncing. The official Twitter client for Android. It was trying to match up the 10,600 followers I have on Twitter to my addressbook!!?!? Running nonstop 24/7. And slowing everything else to a near standstill.