By the end of April we can expect a 1TB HDD from Seagate, it will be part of the Barracuda 7200.11 lineup.
More specifications:
1 Terabyte 7200RPM Sata II Perpendicular recording NCQ 16MB of buffer 4 platers 8 heads
1 Terabyte 7200RPM Sata II Perpendicular recording NCQ 16MB of buffer 4 platers 8 heads