Ah, here's the thing about the Palm Pre: you're not supposed to ever have to sync it yourself, regardless of the system.
Palm put a lot of effort into their Synergy solution, which grabs your calendar data from Google Calendar and your contacts from your email accounts and facebook. Hotsyncing is no longer supported, and there is no bundled software for automatic syncing between computer and Pre directly.
If you just want to transfer images, music, or documents onto your Pre, you can connect it as a USB drive using the included USB cable; your computer should recognize it as a thumbdrive if you select the appropriate option on your Pre.