I’ve been considering starting a personal wiki after reading The Garden and the Stream: A Technopastoral by Mike Caulfield a while back. His article has some great set up and philosophy about the wiki versus blog. I’ve been using my own website/blog as a commonplace book for quite a while now to collect everything from what I’m listening to to what I read and even what I’ve highlighted/annotated online. I’ve documented a lot of the pieces I use to create/customize it. (Not everything I write is public either.)
Ultimately, I think that either way, having a solid search functionality becomes important regardless of which direction one chooses.