Delta used to have an awesome frontend for Timatic (the system that all of the airlines use for determining their own liability in visa requirement issues) that I used exclusively. Sadly, it seems they've removed it from their new site.

I was able to find a similar offering[1] for free on Gulf Air's site, though.

A nice frontend to Timatic would be awesome, but I suspect that the licensing is too pricey...

[1] http://www.gulfair.com/English/info/prepare/Pages/VisaInform...