New Alliance & Leicester* Premier account customers get a £100 sign-up bonus, a 0% overdraft for a year, and 0.5% in-credit interest, if you pay in £500/month. This £100 bonus will outweigh the in-credit interest available anywhere else, unless your balance is constantly high (c. £2,500).
To get the £100, you must use its 'Premier Switching Service' to move across direct debits and standing orders, and pay in at least £500 from a non-A&L account wach month. You should get the bonus within three months of grabbing it. You can bank online, via branch or phone
It also usefully gives free annual multi-trip European travel insurance for the account holder(s) which is great if it suits; yet it's not worth paying to upgrade if you need worldwide or family cover (read Travel Insurance).
In addition, anyone with an A&L or Abbey bank account can currently get a very strong credit card balance transfer deal: 0% for 12 months with no fee. See full details and how this compares in the full Balance Transfers guide.
One slight downside is that anyone who has held an Alliance & Leicester, Abbey or Cahoot account in the previous three months cannot get the bonus, as all are now part of the Santander banking group.