Neat! I was looking for something very much like this!!

Two feature requests:

1) Discrete values: I want to track things say on a scale of 1 to 5, or 1 to 10. It shouldn't be too hard to implement this without cluttering the UI; you can have a check box that says

[x] on a scale of ___

and use the icon of the log as a rating slider.

2) I would like push notifications / alerts prompting me to enter things. E.g. Insulin every 3 hours, or mood every 5 hours.

I would totally pay 5$ for an app that does these 2 things reliably.

[edit: wow dude, this app is buggy :) 2 minutes and I already found one bug: +/- doesnt show up unless you first switch to keyboard and then back to +/-!! Hire a programmer / tester to fix these things and concentrate on the product, it's a better use of your time!]