Tegmark foreground paper is Tegmark 2000. Earlier paper about same stuff is Tegmark 1996.
Reprocessing and extrapolation of the IRAS 100um maps to microwave frequencies is described in Finkbeiner1999 and data is available on their website
408MHz survey is described in Haslam 1981. This has 0.85 degree resolution and is the "default synchrotron map". Finkbeiner et al have also done an extrapolation of the Haslam map using the Reich 1986 1.4GHz 35' NH survey and the Jonas 1998 2.3GHz 20' SH survey. Data is provided here but there doesn't seem to be a reference and their website is hopelessly out of date.
The SUMSS is a 0.8GHz interferometric survey at dec<-30, with 0.75' resolution (similar to NVSS). Probably only useful for finding point sources and anyway they don't appear to have covered C2&3 fields yet.
H-alpha survey is described in Gaustad 2001. See also project web site.
Older synchrotron polarization maps are given in Brouw 1976
There is b<20 deg 1.4GHz polarization survey by the Effelsberg 100m telescope with 10' resolution Uyamjer 1999. Project homepage. The bizarre thing about these maps is the lack of correlation between the total intensity and the polarized emission.
There is also a d<5 deg Candian Galactic Plane interferometric polarization survey at 1.4GHz with 1' resolution.
There is a b<5 deg 2.7GHz polarization survey also by the Effelsberg 100m telescope with resolution 4' Duncan 1999. The same crew have made similar 2.4GHz measurements using Parkes 64m with resolution of 10' Duncan 1997 and project homepage. Vela region shows strong emission in both total intensity and polarization. We might want to map some of the highly polarized regions in their maps to look for correlation...
There is an interesting paper showing polarized emission uncorrelated with total intensity in 2 fields one of which is at b=35 deg at 325MHz Wieringa 1993
There is a 3 deg square polarized map of the galactic center at 8.6GHz with 3' resolution Haynes 1992.
An interesting paper attempting to construct dust polarization maps directly is Prunet 1998