Ok you want suggestion i can give you lots! The login is very important part of the web site you instantly have the users attention on that spot soon as they login plus it's a returning thing for them to go to.
I like to customise things that my users will get to know to go to and use for instance this below is my suggestion and or a wish list.
1). Field to customise Welcome [username] i might want to put happy independence day for one day only or say happy easter [username], happy christass [username].
2) Setting where i can add urls such as user profile url, then next line perhaps i put a text message or another url, room for more urls and lines. From in the settings page.
3). It would be very good to be able to see the users Wavatar,Gravatar next to there name and or an option to turn it on off in the settings.
4). Not a direct wish of mine but the email could be checked and if the user has an twitter account with it put a twitter link into there somewhere similar to what the 'Automagic' twitter plugin does.
5). Logged in as Jaffasoft (logout) (admin) should not be that way. It should be:
Hi jaffasoft or Welcome jaffasoft,
whatever custom link or text
Last Notes: The way the login area switches from login, password, and all the other things seemlessly is great nothing to change there. It's only personalizing it for the user after the login because after all that is what the user is there for! Maybe the title could be customised i from in the settings to if you are doing one.
Thanks for asking for suggestions. If not all the above requests a custom welcome message and the wavatar or gravatar would be the highest one i would like seen done.