For those wanting to bale corn stover, soymulch, or straw, etc. in one pass, directly behind the combine, I'd recommend the Glenvar Bale Direct system. It has been developed over the past several years and works well.
The AETC / ICCHP 2007 powerpoint is on the ASABE.org web site.
Or go to www.glenvar.com for more info.