Terracotta Top 5ive

Forum post—"I would definitely recommend anybody else considering using Terracotta to download 2.6+ because this Cluster Stats Recorder implemented in 2.6+ is really amazing."

Announcement—Scarlet 1.0 Announced. Sourcesense announces general availability of their enterprise-grade clustering solution for Atlassian JIRA built on Terracotta.

Announcement—Compass/Lucene Terracotta Integration

Announcement—Clustering iPoint with Terracotta. Matt Brasier, Senior Consultant at Enterprise Java professional services firm C2B2, provides an in-depth case study of clustering iPoint portal with Terracotta.

Blog entry—"Thanks to Terracotta and your post about the message bus you did, we have stripped all J2EE out of our architecture making it much simpler for service developers, much faster, and much more scalable."—Comment on Mark Turansky's blog.

Ok... I know this is supposed to be top 5, but this deserves a shout-out...
Video—Lightweight Grids With Terracotta presentation by Cesario Ramos at the Portuguese Java User Group.