Over time, manual data entry was just too painful, even when I wrote software
to help me collect data. I replaced manual data entry with RescueTime and highly recommend them.
I bought a WakeMate (YC S09) for tracking my sleep but it didn't go that well, since the company shutdown.
More people have started paying attention to personal analytics (mostly health related). However, I feel that this area is largely under explored.
I'd love to see applications agreeing on standard data formats and writing data to personal data stores that the user owns.