International Support for Ukrainian Democracy is a new site - set up yesterday evening - to cover the events in Ukraine.  It has a great selection of links in both English and Ukrainian language, and a discussion forum.  Check there first for links, but I’d especially recommend:

Fistful of Euros, which is doing its usual excellent job of covering events,

and Obdymok who lives in Kiev.  His latest post, following the announcement that pro-Russian candidate Viktor Yanukovych has been announced the winner ominously says:

just saw thousands of berkut police from kharkhiv and donetsk, as well as thousands of coal miners, start walking in down lesi ukrainky blvd. in the direction of the central election headquarters.

lesi ukraini leads to bessarabsky rynok and the start of khreshchatyk, which is filled with about 100,000 yushchenko supporters.

i think a riot is imminent.