BetOnMarkets, Intrade and others...

[flix]

https://www.betonmarkets.com

Already takes Liberty Reserve, Ukash and a number of other payment options as you can see here:

https://toucan1.betonmarkets.com/d/available_payment_methods.cgi?l=GB

It should not be too difficult to get them to accept Bitcoin, especially considering their international client base. (They even list e-gold as a payment option!, clearly outdated).


http://www.intrade.com

Actually had to leave the US and domicile in Ireland because of US gambling restrictions... Bitcoin would be a perfect fit for them too.
There is even a betsofbitcoin bet (not mine) on when they will accept Bitcoin:
http://betsofbitco.in/item?id=953


In general speculation, trading and betting sites are all good bitcoin fits.

Any other similar sites that you can think of?

[flix]

http://financials.ladbrokes.com

http://financials.williamhill.com

http://www.financial-bet.com/

https://www.betsson.com/

http://www.cityindex.co.uk

http://www.etxcapital.co.uk/

http://www.finspreads.com/

http://www.intertrader.com/

http://www.paddypower.com/bet

http://www.igmarkets.com

http://www.spreadex.com/