[Gmo]

I'm piggy backing on this.

I still have found my holy grail : a kind of knowledge management software where I could just stuff things probably with tags. Not only links (I have pinboard for that) but ideas, snippets of knowledge etc.

This would be online (not necessarily self-hosted) and I'm willing to pay for that.

Accessible via smartphones and potentially with an email gateway would be great.

I don't think mindmapping software fit the bill. I really would like tag and/or full-text search.

Wikis come close but it's quite cumbersome to add a piece of info.

[Scarblac]

My Gmail inbox basically works like that... I send mails to self if I want to store links.

[kejaed]

Evernote seems to meet each of these requirements.

[Gmo]

Yes, from what I heard, it could be a good fit, but I only see negative comments about evernote so ... :)