Every now and then, I go through the domain names like most of us. In late 2009-2011 the following top level domains allowed domain transfers:
AC,AG,AL,AN,AO,ARPA,AW,BA,BD,BI,BJ,BM,BN,BS,BV CI,CU,CV,DE,ER,GD,GE,GN,GOV,GQ,GT,GY,IN,INT,IO JM,JO,KE,KG,KH,KI,KZ,LB,LC,LK,LR,MA,MD,MG,MH,MP MR,MT,MW,NE,NF,NG,NI,NP,PE,PF,PG,PW,PY,SH,SJ,SK SL,SN,SO,SR,SV,SZ,TC,TJ,TM,TN,TRTZ,UG,UK,UY,VG VI,YE,YU,ZW
You should be warned, second-level-subdomain-transfers.txt.tgz is about 55 Megabytes of compressed text and contains all the gathered 1st and 2nd level domain names. A lot of the domains are not updated since late 2009 but the information is still useful for statistics or 3rd level gathering etc.
Feel free to send me updates and/or third level domain scan results etc.