Dropbox and Mac OS X Lion Developer Preview 2.

From Dropbox forum:

This version causes crashes in the latests developer preview of Lion. If you are using a developer preview we advise against running this version. We’re working on a solution. Thanks.

Previously, Dropbox can be used with Mac OS X Lion Developer Preview (1) by changing the CFBundleVersion to 2.0. Apple Engineers warned that Mac OS X Lion blocked Dropbox from running due to some technical issue. Even though the modified Dropbox could run on Mac OS X Lion DP, it crashes the Finder.

Dropbox Engineers are aware of this issue.

Using Dropbox with Mac OS X Lion.

UPDATE 3 (2011-07-20):
Dropbox 1.1.35 is compatible from OS X Lion.
If you’re feeling a bit adventurous, you can use the “forums build“.

UPDATE 2:
Dropbox Team Member Rian H. posted a reply assuring that the team is working to make Dropbox fully compatible with Mac OS X Lion.

“hey everyone, just wanted to give you all a heads-up that we’ll be working diligently on making dropbox 100% compatible with 10.7 over the next couple of months. stay tuned!”

UPDATE:
Apparently the current version of Dropbox caused the Finder to crash right after login.
Apple Engineers have confirmed this and recommended Developers to wait until the issue is resolved. If you are a registered Apple Developer, head to Apple Developer Forums for the discussion.

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Numbers of users are reporting they found out that Dropbox.app would not work with Mac OS X Lion.

You can’t use this version of the application Dropbox with this version of Mac OS X.

One thread on Dropbox Forums is dedicated to this issue. Dropbox user “Filip S.” came up with a solution:

I’ve figured out a quick fix for this issue. Open Info.plist inside the application bundle, and change “Bundle Version” to 2.0 . Apparently Lion doesn’t allow applications with low bundle versions to run for some reason.

Now Dropbox v.1.0.20 works in Mac OS X Lion.

Dropbox info.plist before the modification:

Dropbox info.plist after the modification:

MobileMe iDisk App Update is Available.

If you’re an iPhone and MobileMe user, get the MobileMe iDisk App update now.

MobileMe is available from Apple for $99.99 (Single User) and $149.99 (Family Pack). Go to Apple Retail Store, and often they will sell you MobileMe on a discounted price.

If you’re want to get MobileMe, get it from Amazon for an everyday discounted price (2010.02.17).

If you’re not a MobileMe user, I recommend Dropbox. Even if you’re not an iPhone user, Dropbox is highly recommended.

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Disclaimer

If you bought anything through Amazon link above, and I get some kickbacks.

“If you buy these DVD’s, I can buy a Canon Vixia HF S21” to paraphrase the great Robert Schimmel.