What platform is best for a searchable online library platform for articles, videos and audio?

[Lael]

I have a client who needs an online library for articles, PDFs, videos, and audio. Here are some of the criteria I need met:

1. needs to be searchable
2. needs to be able to accept guest blogging
3. needs to be able to accept user feedback on each item
4. all the items are free.
5. needs to be able to filter results within search results.
6. needs to be able to handle over 10,000 documents/articles that will be put on the site.
7. content needs to be tagged with one or more tags for improved searching.

I am familiar with WordPress but wasn't sure that was the best solution for a more advanced library.  Any suggestions on other platforms that will work for this application?

[OlegKorneitchouk]

Sounds like a forum script would work for you.