Storage – 20Gb (can purcahse more) and can be split between email and idisk.
Push services to iphone – yep it works. On my PC the sync service gets very upset if there’s no internet access and lets you know with annoying pop-ups. (I kind of know that when there’s no internet the sync thing wont work – stop telling me every 5 minutes).
Web hosting – Needs one of the ilfe apps so I don’t use it. (i have a PC).
Also my 2 month free trial has been extended till some point next year so I haven’t actually had to pay for any of this. To be honest I don’t think I’d actually want to pay for the service I get at the moment, yahoo push email works in just the same way and as for push calendar and bookmarks you can always sync them when you connect to itunes. Also the push service eats battery power so it’s judgement call whether the benefits outweigh the battery cost.