In order from top to bottom:
1 New Century
2 Fremont (FMT – industrial bank, big in commercial as well – but check out its 3rdQ financials and see the swing in securitization of residential mortgages. It’s quite something.)
3 Option One (owned by HR Block, up for sale)
4 WMC Mortgage (owned by GE under GE Money)
5 First Franklin (Merrill buying from Nat City for 1.3 bil)
6 Ameriquest (Argent, major lawsuits)
7 Decision One (owned by HSBC)
8 BNC Mortgage (op. subsidiary of Lehman)
9 Accredited Home Lenders (look at its quarterlies)
10 Countrywide Financial
11 Ownit Mortgage (partially owned by BofA)
12 Washington Mutual
13 Mortgage Lenders Network USA (MLN)
14 ResMAE Mortgage
15 NovaStar Mortgage
16 Chase Home Finance
17 Encore Credit
18 Wells Fargo Home Mortgage
19 Fieldstone (lost 45 million in 3rdQ)
20 Aegis Mortgage Corporation

These rankings are published by New Century but I think they are quite accurate.