I was looking for something just like this. A place to collate all my stuff.
I was deciding between Devonthink, keep It, eagleFiler, and for me eaglefiler have the right amount clarity and ease of use.

But I have a question, I have many adobe illustrator files and I think they preview in pdf. But eagleFiler will only show the 1st page, I was wondering if its possible to show all the pages. I think illustrator files preview in pdf.

Everything looks great, but if I have a feature request, it will be to able to import aliases and preview them. That will be so cool. It helps with glancing at the files and seeing the comments that I wrote for it.