Interesting little app that has the potential to be quite useful, but obviously a very early version that still requires a bit of work. My observations (and these may well be fixed/changed in later releases):
1. If you use different Automator Actions in your login items, Exhaust shows them all as 'Application Stub' with no way to tell between them unless you select the item and go and look at the command string. Would be nice to have the name of the Automator Action in the list, or the ability to label entries.
2. There is no way to resize the Exhaust window making the interface rather cramped.
3. There is no obvious way to change the order of items in the list. You can't drag items up or down the list and there are no gadgets on the interface to 'move up' or 'move down'. I got the impression from the description of Exhaust that this feature is already supposed to be there?
4. There is no easy way to export your login items back out of Exhaust. On launching Exhaust for the first time it 'imports' all your Login Items then promptly removes them and replaces them with a single entry for Exhaust itself. This is all well and good if you decide you like Exhaust and want to use it, but if you don't then you have to manually recreate all your Login Items (which can be tricky if you have various 'helper' apps that run at startup and that are buried inside application bundles). The ability to re-instate your Login Items is a must IMHO, especially at this early stage of Exhaust's development. I have (had!) 38 entries in my Login Items list which have now all disappeared and which I am now having to put back the hard way.
5. Just an observation really - Exhaust has no menu bar, so you can't set Preferences, e.g. frequency to check for updates, frequency to make backups of your Login Items list, etc. (Alternative would be to implement it as a Pref Pane?).
Overall - not for me just yet, but an interesting app that I will keep an eye on.