Sorry I was a bit of the date. Someone said that there is some kind of a article on gamespot or gamershell that hl2preload with start today? IS that true? Someone tell me whats going on.
That article was written yesterday and it was referring to the fact that the HL2 preload was supposed to be starting yesterday but it appears as though it's been delayed again.
As it stands, we still know nothing and it wouldn't be a good idea at all to assume it'll be tonight. It will happen eventually and there's no immediate rush for it to happen.
This question could have been answered by yourself if you'd read some of the threads around the forums or used the search function.