Eye-Fi is launching a new generation of wireless memory cards today for uploading photos quickly to the web.

The X2 family of Eye-Fi cards can wirelessly upload photos to the web twice as fast as their predecessors. Anybody with an Eye-Fi card and a camera with a standard SD card slot can upload photos from Wi-Fi hot spots. Participating hot spots include thousands of Starbucks, McDonalds and AT&T Wi-Fi locations.

The cards are available today for as little as $49. They feature the “endless memory” function where the card will erase photos on the memory card after the photos are safely uploaded to a site such as Facebook or Flickr. To upload, you simply turn on the camera and the uploading is automatic. New locations include Marriot Hotels and Harborlink hot spots, including BP gas stations.

It’s getting easier and easier to upload photos and video to the web, so we can expect to see a further explosion of cloud-based photo storage. Mountain View, Calif.-based Eye-Fi was founded in 2005. The Eye-Fi cards are available at Best Buy, Office Depot, Amazon.com, Adorama, B&H and J&R. Investors include LMS Capital, Opus Capital, Shasta Ventures and TransLink Capital.