READ_COMMITTED_SNAPSHOT support in SQL Server 2005 Express
Yes from that link it supports it. A Database Snapshot is a read only "frozen in time" (when the snapshot was taken) view of data. This is a tool useful in some  recovery, reporting and rollback preparation scenarios.

The isolation levels you are asking about are all covered by the line talking about Snapshot Isolation Level (Row-level Versioning).

I would question what sort of workload you are putting against SQL Server Express that needs a snapshot isolation level as there are other restrictions on SQL Server Express that tend to make it not a great fit for busier, high concurrency apps (Most notably database size and memory restrictions) but this is certainly supported from that edition features matrix you linked.