A big part of my day is dealing with bug reports - making sure they have enough detail for developers to understand, going back to users with workarounds or questions about browsers, setup etc. Finally making sure bugs reports have the right priority and adding them in to the work backlog (yep, we're talking agile here).
Next priority is making sure I know what's coming up, talking to the product managers, tech leads (lead developers), designers and being part of acceptance criteria (requirements) creation. Using this info to write tests plans before development is complete.
Next up its releases, I make sure all releases are passing our release acceptance criteria (currently a set of tests). Sometimes I test them but other times I've worked with the developers so they know what to test. New features are tested (and earlier I would have written a test plan).
Strategy gets squeezed in when there is time - reviewing how tools are working for us, reading books, blogs, STC etc. Coming up with new ideas to make things faster and less buggy