I've been baying at the moon about how much I hate to hear from people "mid-query"--the time between "yes do send me that partial/full" and "let's dance/go home unhappy".
I'm reminded of those howls today cause I have three nudges in my mail box this morning and a Snarkling sent me a link to someone else who wants you to quit shooting yourself in the foot.
Being pushy is an art form and most people don't do it well. If you just can't stand to not know, ask specifically "when should I email you if I haven't heard from you". Do NOT just email cause you're "pro-active". That's not a persuasive tactic from where I sit.
Just a reminder: don't email me to tell me you're going on vacation. After the temperature hit 98 yesterday in Central Park, it's tantamount to a neener-neener call. Don't email me to tell me someone else is looking at this unless I asked for an exclusive; I assume I'm not your one and only...yet; Don't email me to tell me you've got another eager blurber on the line; I don't care. Don't email unless you've gotten an offer of representation, you've signed with someone else, or very very seriously reworked the pages I'll soon be reading.