I start everyday with two tabs open and one of them is Trelliswork. I love that it lets me document decisions and when I need to reference something we decided last week, it's right there.
...everybody can contribute, and everybody can be in there together. And then you've got transparency into what you talked about and what needs to get bubbled up.
We've been working in Google Docs and Spreadsheets for so long, but I really like being able to see and plan my agendas all in one spot, because it's usually just all over the place ... or nowhere.