Reviews:
Baryon Acoustic Oscillations
Daniel Eisenstein's site on acoustic peak physics: https://www.cfa.harvard.edu/~deisenst/acousticpeak/
Cosmic Microwave Background (general)
White & Cohn (resource letter), astro-ph/0203120
Challinor & Peiris, arXiv:0903.5158
Hu, arXiv:0802.3688
Wayne Hu's CMB tutorials: Basic, intermediate
CMB Polarization
Tutorial by Wayne Hu: http://background.uchicago.edu/~whu/polar/webversion/polar.html
Dark Energy
Weinberg, Mortonson, Eisenstein, Hirata, Riess and Rozo: Observational Probes of Cosmic Acceleration
Linder (resource letter), arXiv:0705.4102
Frieman, Turner, & Huterer, arXiv:0803.0982 (shorter review: Turner & Huterer, arXiv:0706.2186)
Copeland, Sami, & Tsujikawa, hep-th/0603057
Dark Matter
Hooper & Baltz, arXiv:0802.0702
Bertone, Hooper, & Silk, hep-ph/0404175
Distance Measures
Hogg, astro-ph/9905116
Galaxy Clusters (cosmology)
Borgani, astro-ph/0605575
Galaxy Clusters (simulations)
Borgani & Kravtsov, arXiv:0906.4370
General Relativity
Carroll, gr-qc/9712019
Gravitational Waves
Centrella (resource letter), gr-qc/0211084
Inflation
Baumann & Peiris, arXiv:0810.3022
Supernovae (Type Ia)
Wheeler (resource letter), astro-ph/0209514
Filippenko, astro-ph/0410609
Weak Lensing
Huterer, arXiv:1001.1758
Hoekstra & Jain, arXiv:0805.0139
Munshi et al, astro-ph/0612667
Other
List of review articles from Sean Carroll's site: http://preposterousuniverse.com/reviewarticles.html
Cosmology resources compiled by Joanne Cohn and Martin White: http://astro.berkeley.edu/~jcohn/tcosmo.html