Almost always at least 2 (the case as I sit at my desk right now), but usually 3-4. The two are typically a modern folder and an SAK. More often than not I'll add a traditional, which serves the sole purpose of being for my pure enjoyment. Then, when I'm out and about, I usually carry a fully serrated Dragonfly just for use on the occasions that serrations come in handy. That one rides so unobtrusively in the back pocket that I usually don't think about it until needed and often forget to even take it out for EDC pics.
There are some variations depending on activity. For instance the traditional gets replaced with a fixed blade for hiking and outdoor activities (or sometimes just because), the SAK gets replaced with the Swisstool when I'm working on a project or fixing something that day, and if the SAK doesn't have a file it sometimes gets accompanied by an ALOX classic.