Right now on Getjar you can get Tapatalk for free, totally legit, with updates as they're released.
As far as I know it's only for this week, so jump on it while you can.
There's a roundabout way to get the Getjar app, since I can't find a direct link. But regardless:
1. On your phone, load the browser of your choice, and go to m.getjar.com
2. Click on any app on the list, it doesn't matter which, and once that page loads, click download. (You won't be installing it, don't worry.)
3. A new page loads and should prompt you to download/install getjar.apk. Do that.
4. Load up the Getjar app.
5. Search for Tapatalk.
The latest version of Tapatalk (1.13.5) is pretty damn nice, I must say. Viewing an image is now possible without wanting to throw your phone across the room. Quotes now include the author of the quoted post, and you can tap on the link to go to their post, as you can on a browser. It's like I don't even need a laptop anymore!
edit: iPhone users - if you haven't been able to upgrade from your iPhone yet, then unfortunately you have to go through Apple's own App Store, as Apple disallows anything that's from a third party (unless you jailbreak your phone and install pirated apps, which of course voids the warranty). The link is here: http://itunes.apple.com/ca/app/tapat...307880732?mt=8 It's $3, which is slightly on the expensive side for an app (I typically only see media player apps that high), but it is a rather useful thing. Naturally though, your purchases won't carry over to the Android Market, so keep that in mind if you're really cheap (like I obviously am, or I wouldn't have posted how to get it for free).