FrugalNYC has been using FreeNAS a lot over the last few weeks and put together some useful posts:

9 great things about FreeNAS

9 Reasons To Use FreeNAS At Work

11 FreeNAS Tips

Data Recovery using FreeNAS

Are you using FreeNAS yet? Please let us know in the comments below how (backup server, file storage server) and where (at home / work)