We paid his driving lessons and then a third of his Uni living costs, another third came from his student loan and the final third from his savings (from a small inheritance from his grandparent).
When he left Uni and moved away to a new city for his first proper job, we did a lot of leg work with finding him a flat, we paid his flat deposit, and we did a few runs in the car taking him to view flats and then to move him and his stuff over there. We also gave him our old car so he had his own transport (worth £1k!) and not have to buy his own car. Part of moving him in was paying for quite a bit of house stuff such as first big food shop, cleaning materials, bits and pieces of furniture, fixtures and fittings, microwave, kettle, vacuum, bedding, etc. We went halves on furniture like sofa, bed, desk, drawer units, etc.
All in all, not much financially, but more a matter of helping him out practically to ease the transition and getting him set up to look after himself.
Looking forward, we'll be giving him a lump sum as a house deposit when he comes to want to buy his own home, but we'll be doing a "match", i.e. we'll give him the same amount that he saves up for himself.