Mine's easy, greyser's list would have me disowned by my wife.
I bought my first DSLR in 2011, the K5.
18-55 WR
SMC-A 50/1.7
SMC-A 70-210/4.0
Tamron/Quantaray 70-300
Tokina 28-70/2.8-4.3
I literally (Dec 31st, 2011) just bought the DA 18-135 to replace the kit lens. The kit lens 18-55 will either be sold off, or kept if it looks like we may be picking up a second body, TBD right now.
I'll be buying the Tamron 28-75/2.8 as the next lens, unless someone manages to put out a moderately priced 17-70 2.8.
From there, "things get complicated"/unknown. Mostly flip-flopping between the DA* 60-250/4.0 or a Tamron or Sigma 70-200/2.8, with a possible "detour" into a used 55-300 along the way, and possibly a few primes in K or KA mount - 28/35/55/100, and maybe an FA50.