[SOLVED] Clone SD to larger SD

[griv]

Due to size constraints I've purchased a larger SD card than I currently use, and am hoping to simply copy the full contents of the SD card to my new larger SD card. I've read the wiki and forum and found a few different options (use dd, win32diskimager, xbian-config) but am a bit confused as to which one is suitable for me.

If I load the SD into my linux laptop I can see two drives, xbian and xbianboot.
If I load the SD into windows it shows as multiple drives all unreadable except for xbianboot.

Would the easiest way be to run win32diskimager and copy the readable drive and write this to the new SD? I've read that win32diskimager should copy the full SD contents even though multiple drives are shown, and that xbian will resize the partition on startup. So this seems like the best option?

Thanks in advance.