I drink a lot of different herbal infusions, I currently have nettle, dandelion, fennel, peppermint, camomile, liquorice and a blend called "Sweet Chilli" in my tea cupboard. I used to have a lot more but haven't restocked yet after our recent move. I guess rooibos (redbush) also counts as a herbal infusion as it's not actually tea, unlike green and white tea (also found in various formats in my cupboard!) which ARE tea.
My favourite though? Hard to pick one, as I drink different infusions at different times of day or to treat different conditions..... but probably liquorice. Certainly at this time of year, it's warming and comforting and I just love the taste :)