i think i just rooted, i'm not really sure. my bootloader # changed from 1.46 to 1.49 so i think i did something, but can someone please explain "flashing a rom". this stuff is really confusing. thank you
Flashing a ROM is merely the process after downloading the zip file of the ROM, which is a compressed version of the working files you'll be installing, and then moving that zip to your sd card, then via recovery mode, flashing the ROM into your phone.
- Download a ROM of choice to your computer
- Plug your charging/USB cable into your computer's USB port
- Select "disc drive" on your phone
- Wait while your computer recognizes the phone then select "view files"
- Drag the zipped ROM to the sd card (that's the top directory in the sd card's hierarchy)
- Disconnect the USB cable.
- Power down your phone
- Hold the volume up key and press the power button
- Select "wipe"
- Wipe and Dalvik wipe (two operations)
- Press the volume down key
- Select flash
- Select your ROM's zip file
- Press the track ball.
(go slowly

)
Here is a page with some ROM starting points. Have fun.
Known Droid Eris Roms, Patches and Hacks - UPDATED 05-11-2010 - xda-developers