So, you didn't backup anything. Hard lesson learned there, but you'll know better next time.
You need to dl gapps to your computer, then add the zip to your sdcard's root with a card reader. Myself, I would power down, pull the sdcard, copy CM7 and gapps zips to the card, stick it back in the phone, boot into recovery, wipe/reformat everything EXCEPT SDCARD (see what data is still there later) and use CWM to install CM7 first, then gapps.
After you've gotten it to boot up and gotten your main gmail account synced, hit the market on your computer, and look at your library. At least there you can see everything you had previously. If you didn't reformat your sdcard, you might even have app folders still usable by re-installed apps.
If you didn't sync your contacts with your gmail account, make sure you do it from now on. You'll never lose them again.