List of recent champions for factoring Cunningham numbers:

Pollard p-1:
5267	P58	2,2098M	P. Zimmermann
4871	P57	6,396+	P. Zimmermann

Special number field sieve by size of number factored:
5501	c307	2,1039-	K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik
5331	c274	6,353-	Aoki+Kida+Shimoyama+Ueda

Special number field sieve by SNFS difficulty:
5501	c307	2,1039-	K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik
5331	c274	6,353-	Aoki+Kida+Shimoyama+Ueda

General number field sieve by size of number factored:
5158	C176	11,281+ Aoki+Kida+Shimoyama+Ueda
5604	C165	6,383+	Mersenneforum+Womack

Elliptic curve method:
5418	P67	10,381+	B. Dodson ECMNET
5135	P66	3,466+	B. Dodson ECMNET

Largest penultimate prime factor (ultimate factor shown also):
5331	p120*p155 6,353-    Aoki+Kida+Shimoyama+Ueda
5557	p113*p125 3,499+    Kruppa+Silverman+Leyland/Bahr/Franke/Kleinjung

	First five holes in each table on July 7, 2008

2,823-	c197	2,827-	c172	2,853-	c212	2,857-	c255	2,859-	c203
2,823+	c229	2,851+	c214	2,853+	c221	2,859+	c233	2,865+	c178
2,1538M	c208	2,1586L	c156	2,1598L	c171	2,1598M	c160	2,1606M	c194
2,824+	c193	2,832+	c175	2,836+	c162	2,856+	c223	2,860+	c197

3,523-	c233	3,527-	c160	3,529-	c237	3,547-	c242	3,551-	c238
3,508+	c188	3,509+	c171	3,517+	c220	3,521+	c181	3,538+	c177

5,331-	c187	5,341-	c175	5,347-	c210	5,361-	c189	5,383-	c183
5,331+	c193	5,346+	c174	5,353+	c231	5,358+	c233	5,361+	c221

6,311-	c168	6,313-	c227	6,335-	c170	6,341-	c224	6,343-	c226
6,302+	c173	6,304+	c216	6,314+	c209	6,316+	c210	6,317+	c225

7,277-	c201	7,311-	c225	7,313-	c248	7,319-	c233	7,323-	c241
7,277+	c165	7,281+	c193	7,293+	c187	7,296+	c190	7,304+	c244

10,263-	c216	10,269-	c233	10,271-	c214	10,277-	c224	10,281-	c210
10,236+	c193	10,241+	c175	10,244+	c215	10,247+	c201	10,248+	c199

11,227-	c195	11,229-	c217	11,233-	c181	11,239-	c246	11,241-	c220
11,226+	c222	11,233+	c200	11,241+	c242	11,244+	c247	11,254+	c228

12,233-	c215	12,239-	c202	12,247-	c209	12,257-	c269	12,269-	c205
12,232+	c181	12,253+	c169	12,254+	c230	12,256+	c228	12,259+	c194