I love Torchwood with unconditional devotion. At this point, I'm pretty sure there's nothing that will change that (bar Steven Moffat taking over, I guess). Torchwood is also the only show on TV where you start each new series with no idea of what it's turned into this time, which I assume is how RTD stops himself getting bored with it.

Also, they tested the ageing process of the unkillable humans by looking at their telomeres, and I went all giddy. Telomeres!