It is now easier to manage accounts with your admin console. You can create custom groups of accounts. For example, You might create a group for custom development accounts. You could create a group of accounts for prospects or for follow ups.
To organize your accounts, go to the account detail page and click the settings link. Click the add/edit button in the account tags section. You can add new tags or select existing tags for the account.
After tagging accounts, you can click the "Account tags/groups" link in the left side menu to view all your tags. You can use the "--- view group/tag ---" drop down to go directly to the list of accounts with a specific tag.