Since LL started with banners on their website I was highly annoyed, no stronger I hate them especially since I am a paying user of SL and it does look so cheap I think :-/ Therefore I installed the open-source downloadable AdBlock for my browser. I believe not all browsers work with the same version of AdBlock but should you be interested I can highly recommend it :)

Underneath some links to download pages and an informative Wiki about AdBlock.