Displays Last.fm cover art, friends, charts, shouts, loved tracks and user info.
[lastfm tab="albums, friends, charts, artists, info, recent, loved, shouts" count="3" titles="true"]
You can use the following functions: albums, friends, charts, artists, info, recent, loved und shouts. You may combine two or more of these functions with commas. The title-parameter enables/disables output of the corresponding title for each function. Title and count are optional. If not provided, the plugin options will be used.
The css file is just very simple and probably not optimal for your blog. Also the file will set a fixed image with and height so the image size options in the config menu will be obsolete. Use the file for 'large' images and if you want to use the hover-effect, otherwise better build your own. In that case create your own CSS file with the name lastfm.css in your template directory to overwrite the default one or deactivate the option and put your CSS rules in your theme's style.css.
You probably use the provided css file. It will set with and height to 126px.
Sure you can - but you'll have to build your own css file.
All the information on your Last.fm-Sidebar is cached for the time you set in the plugin options. When you clear the plugin's cache, the last track you listened to should be displayed.
Try to lower the count of displayed entries. Especially the charts will cause a quite big request to Last.fm because it will query all the albums you listened to and not just the amount you configured (blame Last.fm). All the other options will just query the amount of entries you specified. You could also increase the cache expiration.