Okay, this is a no-no for me!
If you send an email to several users with GMail and put all in the bcc field (including a copy to yourself), you can than see in your inbox who received this messages. So if anybody watchs over your shoulders, he/she sees all the recipients... I am okay with showing the recipients in the sent folder, but not in any other folder.

Can anybody confirm this? If Google can not remove this, hopefully somebody writes a GreaseMonkey script.

"Okay, this is a no-no for me!" – I'm assuming you only found this out now.. You seemed to manage fine before.. Why not just type the addresses in the To section?

Corsin... but only the one who sent the message sees the BCC list, is that what you mean? So then it's no problem... or do you have very nosy colleagues? Maybe you should wait with Gmailing when they're gone :)