1GB Free (Paid plans up to 1TB; e.g. $5/20GB/year shared across Google services including Gmail)
Private URLs and limited settings control access. However, images may be indexed for Google Search and Google has a history of overstepping user privacy.
Relatively easy to use interface. Desktop client, batch uploading, integrated photo editing via Picnik, and other intuitive features typical of Google products make this easy to use.
Web, desktop (Windows and Mac), and mobile
100MB/month or unlimited storage for $24.95/year
Unlimited file size
User retains all ownership rights (unlike with Facebook) and only those with the private URL may see the album
Easy to upload photos via the web and even through email attachments