PIM & GTD : Application Choices

[JayEpoch]

Tasks: (GTD - Get Things Done)
OmniFocus
The Hit List
Things

Data: (PIM - Personal Information Management)
OmniOutliner
Yojimbo
Evernote
Devonthink

Is there an app that merges these things or should they be separate? For me tasks are quite linked with data.