If Assange had just gone to Sweden like he was expected to then nothing would have happened with the police, if any high value media personality was wanted on an international arrest warrant and sought refuge in an embassy like Assange has done it would have warranted the same media attention and thus the same police presence.
The Assange case may be full of suspicious circumstances, but I don't think the heavy police presence at the embassy is anything other than the result of the media circus surrounding the situation (which is of Assange's own creation).
Does that sound like standard operating procedure to you?
And what's this "If Assange had gone to Sweden" nonsense. He was in Sweden, in fact he prolonged his stay for a month and a half longer trying to talk to police. They did not even want to interview him.
Now months later they're trying to extradite him back into country.
If you don't find this all suspicious, then you aren't paying attention.
There is at least one politician, who's name completely escapes me at the moment but she was either a rep in the EU parliament or the swedish one, who confirmed that extradition to the US from Sweden was the entire point of the circus.
And Bradley Manning is still being tortured in military prison right now.
I haven't seen anything to make this seem ridiculous or even unlikely. If he was convicted of treason, as he would be, I can't imagine being public would mean anything other than more media attention.
edit: as pyre pointed out by torture i mean extended solitary confinement. I call it torture because everyone who studies it calls it so. However it is true that people think the hypothetical Joe "ignorant american voter stereotype" Average disagrees. If you feel my use of the word "torture" was unfounded then do look at the literature and read the statements of people who have experienced both extended solitary confinement/sensory deprivation and physical torture. I am very certain you will agree with me afterwards.