Kiddo is now sitting up by himself (although his little abs aren't quite strong enough to stabilise him for very long), and as long as he doesn't sway left, right, or backwards... he's quite happy sitting and playing by himself. Swaying any way but forward will usually lead to him flopping onto his side or back - although he doesn't feel that bothered by it :) He also seems to have discovered his voice and now yells randomly at things (e.g. his toys, one of us, the ground), which is quite funny really. He's impressively loud for a little person.
Anyway - a few photos. One of him about to head to bed (and giving Daddy the "Where is she taking me?" look) and one of him in the bath tonight: