The new IPA approval via email function is pretty nice. You simply select this option within the UserAction and whatever Actions you set up are available as buttons within the email notification to your approver.
Of course you do have to select the HTML format and select to send email notifications in the UserAction, but if you set the correct flags, it works great.
The URL behind the action buttons in the email contains an encrypted data string which actually passes your login and password so you don't have to stop at the login page, but it does open a Landmark browser window confirming the action that the user took.
There is a down side - if, for some reason, this email is forwarded to another user and they click the approve button then the action will be recorded as being performed as the original user (since their user id and password is encrypted in the link).
Keep this in mind when you are evaluating the benefit / risk of using this new feature.
Some of you might remember that I played with this a couple of years ago and my solution contained the Action buttons but required the user to log in. My solution was a bit complicated and the interface wasn't as clean.
Infor is looking at adding an option to require the user to log in when they click the Action buttons in the email. This should reduce the security risks that some people might feel is too great.