Oh I've got a closer...

For business letters to people I don't know or am just initiating a contact with, I usually go with "Sincerely". I could see using "Thanks" if the nature of the letter would indicate it.

After a few exchanges, or with people I'm familiar with, I fall back to "Later".

later
Tom

When "Thanks," isn't appropriate, I tend to alternate among:

Best,
All best,
Best regards,
Regards,
Cheers,

...depending on my relationship with the person involved. With the three people on my team, I sometimes don't use a closing statement at all (just my name), because there are so many emails flying among us all the time.

and now I know who I've been subconsciously copying. :)

That's funny; what I use is:

Cheers,
--Mark

So I wholeheartedly approve of using "cheers"!

I usually say "Thanks". When I don't I tend to just sign my name with no closing statement.

I just sign my first name.

To my teammates, I'll say "Thanks" or "Cheers" (to Brits, the two are synonymous). To partners, clients, and people I have more formal relationships with, I'll say "Regards" or "Kind regards."

I have always read Thanks as being 'Thanks for taking the time to read this', so I always close with it.

"I am delighted to remain, your most humble and obedient servant..."

(OK, maybe that's a bit much. I've been known to use "yr. obt. svt." in non-business contexts, though.)

How about:

You're welcome,

I use "thanks" often, even when it's not actually appropriate. I think "cheers" works, in an informal work environment. I've also been known to use "sincerely" or just a dash and my name.

I almost always use "Thanks", because I think I am almost sending something that is appropriate for. Even if it's just "thanks for your time." Perhaps "Thank you" if I'm being extra especially formal. Other times I just sign my name.

I find myself using "Many thanks" a lot, for the same reason.

I use "Thanks" or "Thank you" if I've requested something or if I'm replying to an email where someone has done something for me.

For informational exchanges between myself and those with whom I've previously exchanged emails, I just use my first name only.

For email to strangers or potentially automated ticket things, I just attach my .sig that has my contact info without any closer.

I use different things, depending on context. Sincerely for the most formal; Best for almost everything else; Best Regards when dealing with people overseas (mirroring what they send to me); Thanks when appropriate. I never use cheers--it seems a bit too informal for a work context.

I use just my name a lot, as others have mentioned. If it's someone I don't know well and I'm answering a question (which I often am, given my job), I use "Hope that helps!".