i have an xperia x10A from rogers in canada. i had updated it using SEUS and then rooted it to the FW 23 rom. anyways the new easy method came out and i decided to root to the FW 26. it was very simple, just go to this thread:
and download the megaupload rar file that is headed as
Exploid Root for X10a (contains Generic R2BA026 X10a)
(it is the first download in that post)
once u have that downloaded, unrar it into a folder and read the text file named IMPORTANT.txt
the instructions are pretty clear from that point, and when ur ready to run the 'RootX10a_v2.cmd' file, just right click it and run it as administrator. follow the instructions and u should have it rooted to the latest 26 rom.
NOTE that all ur stuff will be lost in this transition so back up whtever u can before u do it.
good luck hope i helped!