10 Minute Mail allows you to create temporary email addresses that expire after 10 minutes. It’s great to use for sites that require you to receive something through email but you don’t want to be bombarded with spam.

Basically: Use it for those sites which ask you to give your email address to complete some registration process and the service doesnt require you to use the email in the future.

YouSendIt allows you to send large files to other people when the files are too large for your email. This tool is a great alternative to using FTP.

YouSendIt

YouSendIt is a web-based pseudo-SaaS digital content delivery service provided by YouSendIt, Inc. It lets users send, receive and track files on-demand. It is an alternative to sending large e-mail attachments, using FTP, and sending CDs or DVDs or tape or USB flash drive via courier. The sender can enter the recipients’ e-mail addresses, attach the file and send it; the recipients receive an e-mail notification with a URL that lets them download the file. With more than five million registered users from 220 countries, YouSendIt once transferred over 40,000 GB per day and over 500 million files to date.

Basically: A  pretty useful site which allows you to send files which your email service would say are too large or unable to send.