If you are still trying to get to grips with the idea that the Universe's expansion is speeding up, check out Schrabback and colleagues' scrutiny of the largest continuous area ever imaged with the Hubble Space Telescope - the COSMOS field (T. Schrabback et al. Astron. Astrophys. in the press; preprint available at arXiv:0911.0053). Their study is not only one of the most comprehensive analyses of the 'weak gravitational lensing' effect that is caused by large-scale structures in this distinctive part of the sky, it also uses this effect to provide independent evidence that the Universe is indeed expanding at an increasing rate.
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