I like nudgemail.com for the contact reminders/nudges and a new service called Receivd for managing lists of people and sharing files/content with those lists.
Been using the Alpha for the past few weeks, and the product is super slick and polished for the first release.
I'm not sure why people are talking about the landing page, domain name, and other irrelevant stuff. Dropbox is really good at syncing files across systems, but not that great for sharing files quickly and effortlessly. Receivd in my opinion is trying to solve this problem.
Hey ivan, I will be launching my startup at techcrunch50 this year, looking for someone to come on board with co-founder type equity prior to closing funding email me at sid dot Viswanathan at gmail if interested -sid