Publicate.it is my favourite new curation tool right now. Developed by Chris Bradley, it's just finished a lengthy beta and is fully available with both free and paid versions.
Do check it out at Publicate.it after you've heard Chris discuss the multiple ways it can be used as part of your marketing mix.
I particularly like the MailChimp integration; however, it's real strength lies in the way it can be used for lead generation. Too much curation work right now seems to be about blasting out quality links via social channels to build your repuation as a thought-leader. Publicate enables you to create smoother channels that feed directly into your lead generation pipeline.
Although I had reservations about the product at beta level, it's now extremely exciting.