Actually the main reason I started building it in the first place was because I couldn't find any "central" log site online and most of the ones I did find either charged or were very lacking in features and functionality.
Just wondering, did you find
divelogs - Online Dive Logs during your research?
It neither charges nor lacks features. To name a few:
- 20+ logbook imports from all major DC manufacturers. Gets your complete logbook online in under a minute.
- Linking buddies ("buddy network")
- Google Maps, Pictures, Videos, Profile Graphs
- two PDF, eBook (epub), excel, Google Earth exports
- API for syncing with other software (Diving Log 5.0 is one that uses it)
- Can be public, password protected or completely private
- Search over all public logbooks by text or location (in a map)
- Currently over 3000 divers and over 270.000 dives logged, over 10.000 pictures, over 50.000 locations (maps)
- Edit your logbook online as if you were in Excel
- Available in 3 languages
- registered Divers from over 80 countries
...and quite a bit more
I don't want to stop your enthusiasm or even your development, but it's all already there...
just my 2 cents