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Let's just get this station built so NASA can go on to do more useful things. Here goes yet another truss segment and solar panels. This will be the third truss installation in a row, not to mention the cycle before the Columbia accident with three truss installations and three general maintenance missions. Oh, and STS-118 (the next mission) is also a truss installation mission. For future space stations I hope they use a 100 ton rocket to put the truss up in one piece, and then use their smaller rockets to add the other components. Building it one piece at a time is annoying!

Element	Flight	Launch date	Length (m)	Diameter (m)	Mass (kg)
Z1 truss	3A – STS-92	October 11, 2000	4.9	4.2	8,755
P6 truss – solar array	4A – STS-97	November 30, 2000	73.2	10.7	15,824
S0 truss	8A – STS-110	April 8, 2002	13.4	4.6	13,971
S1 truss	9A – STS-112	October 7, 2002	13.7	4.6	14,124
P1 truss	11A – STS-113	November 23, 2002	13.7	4.6	14,003
P3/P4 truss – solar array	12A – STS-115	September 9, 2006	73.2	10.7	15,824
P5 truss	12A.1 – STS-116	December 9, 2006	13.7	3.9	1,864
S3/S4 truss – solar array	13A – STS-117	no earlier than June 8, 2007	73.2	10.7	15,824
S5 truss	13A.1 – STS-118	no earlier than August 9, 2007	13.7	3.9	1,864
P6 truss – solar array (relocation)	10A – STS-120	no earlier than October 20, 2007	–	–	–
S6 truss – solar array	15A – STS-119	July, 2008	73.2	10.7	15,824

Building it one piece at a time is annoying!

It's only annoying because we fly so rarely. If we had a system capable of flying weekly, or daily, you could put up a huge station very quickly, without the need for heavy-lift vehicles. And it would be much more affordable as well.