If you've browsed through the packet captures available on this site recently, you may have noticed a new link next to the download link for each: "view online." Thanks to the remarkable work of a company called QA Cafe, you can now view packet captures online via a new free service dubbed CloudShark. Their (short and friendly) press release is here.
CloudShark is essentially a lightweight mock-up of the Wireshark packet analysis interface ported to be completely web-based. To open a capture file in CloudShark, you can upload it directly, reference it by URL, or email it. Here's an example using the capture from last week's TCP Selective Acknowledgments (SACK) blog post.
CloudShark's interface is very slick, and mimicks very closely the behavior of Wireshark. For example, you can expand and select individual headers and fields within each packet in the second pane. As in Wireshark, selecting a particular field should highlight the corresponding raw data in the third pane (this may not be working on all browsers but I can confirm it works with Firefox 3.6). Cloudshark even supports display filtering.
The CloudShark FAQ explains that the analysis is actually wrapped around tshark, a console utility which belongs to the Wireshark family. This is already a rather impressive project, and I'm curious how it might grow from here.