I have a Xperia X8 with the Rom "Froyobread" installed, too.
At my homescreen I can't find the "3G" symbol like its normal as on Apple's IOS.
But there is a "H" below the two arrows, which indicate the up- and download.
The "H" stands for HSDPA - High Speed Downlink Packet Access. I think its the same as the "3G Standard".
If there is an "E" below the 2 arrows, indicated at the top corner, you have only the slower EDGE Connection. As a consequence, it is the "2G Standard".
Greetings from Germany.