Or is 2.1 the newest?
4.0 is newest
2.1 > Eclair
2.2 > Froyo
2.3 > Gingerbread
3.0 > Honeycomb
4.0 > ICS
Nothing like 2.4 !
2.1 is the last official release for the Eris. There are Custom ROMs that will give you 2.2 (not recommended) or 2.3 (better).
4.0? that sounds extreme. i think my dad's razr is 2.4
any names or links to rom downloads/info?
You will find most ROMs here:
Droid Eris Android Development - xda-developers
Make sure you read the threads and follow the instructions carefully.
Separate names with a comma.