Finale is a fully-featured Last.fm client with lots of advanced features, including support for easily scrobbling the music around you!

The app allows you to do many of the most common tasks you'd otherwise do on the website:
• See your recent scrobbles
• View your top tracks, artists, and albums over a certain period
• View your weekly charts
• Check your friends' stats
• Search for and get details about albums, artists, and songs

The app also includes lots of advanced features:
• Manual scrobbling
• Batch album scrobbling
• Scrobbling from friends
• Generate beautiful collages of your top artists, albums, and tracks over various time periods
• Search and scrobble from Spotify's database

Finale is, has been, and always will be 100% free, ad-free, and open source. You can find a link to the source code on the About screen. If you like the app, consider leaving a review.