I really like the ability to create new addresses whenever I want and organize them with labels, makes it very easy to sort different transfers. However, my bitcoin client is generating a new address each time it's opened, even if no transfers have taken place. I feel that this is redundant and it's cluttering my address book with unused addresses because I restart my computer (and this application) quite often - much more often than I actually transfer bitcoins. Is there any way to disable this feature?

samething happening to me, I never clicked the "new" button even once, had always used the address I first got. But I am seeing 6 new addresses currently sitting in my address book.

This has been happening to me too.

I kinda figured it out, the bitcoin client automatically makes "New..." active focus, thus when you press any key with the bitcoin client in foreground, it makes a new key. Has happened to me 6 times so far.

Edit: I also noticed it does make a new address when the application is first started and or receiving a transaction (I got bunch today and there were several new addresses).

This was on a newly upgraded installation with the latest bitcoin available from bitcoin.org (win). The AppData folder was the only one remaining from previous installation for wallet. 

This doesn't help track at all, in fact it does the opposite, it clutters up my "receiving" address book. I've seen it generate new addresses for transactions *from* the same person (but that person is only sending to the address he knows). None of the new addresses are used for anything it's just automatically generated.

Tell me how the sender would know the auto generated address when it's only generated if he sends payment to an address I've shared with him?

Just so you know, we are talking about the Windows client automatically generating "Receiving" addresses, without being asked to generate them. Yes I do have multiple addresses for different people so I know where the transactions come from, this is another case, the client is randomly generating addresses due to something that looks like a UI and or some other bug.

I was going to copy over a nightly build and see if it does the same, but the version number of nightly builds I see are much older than the current release on bitcoin.org