I sent an e-mail today to Ellice Lieberman. She's a Harvard professor in the School of Medicine. She practices at Brigham and Women's hospital. Most importanly, she's published quite the body of work regarding risks associated with epidural analgesia.
Lieberman E, Davidson K, Lee-Parritz A, Shearer E. Changes in fetal position during labor and their association with epidural analgesia.
Obstet Gynecol. 2005 May;105(5 Pt 1):974-82.
PMID: 15863533

2: Lieberman E. Epidemiology of epidural analgesia and cesarean delivery.
Clin Obstet Gynecol. 2004 Jun;47(2):317-31. Review. No abstract available.
PMID: 15166856

3: Goetzl L, Cohen A, Frigoletto F Jr, Lang JM, Lieberman E. Maternal epidural analgesia and rates of maternal antibiotic treatment in a low-risk nulliparous population. J Perinatol. 2003 Sep;23(6):457-61.
PMID: 13679931

4: Fisler RE, Cohen A, Ringer SA, Lieberman E. Neonatal outcome after trial of labor compared with elective repeat cesarean section. Birth. 2003 Jun;30(2):83-8.
PMID: 12752164

5: Eltzschig HK, Lieberman ES, Camann WR. Regional anesthesia and analgesia for labor and delivery. N Engl J Med. 2003 Jan 23;348(4):319-32. Review. No abstract available.
PMID: 12540646

6: Goetzl L, Evans T, Rivers J, Suresh MS, Lieberman E. Elevated maternal and fetal serum interleukin-6 levels are associated with epidural fever. Am J Obstet Gynecol. 2002 Oct;187(4):834-8. PMID: 12388959

7: Gross JB, Cohen AP, Lang JM, Frigoletto FD, Lieberman ES. Differences in systemic opioid use do not explain increased fever incidence in parturients receiving epidural analgesia.
Anesthesiology. 2002 Jul;97(1):157-61. PMID: 12131117

8: Lieberman E, O'donoghue C. Unintended effects of epidural analgesia during labor: a systematic review. Am J Obstet Gynecol. 2002 May;186(5 Suppl Nature):S31-68. Review.
PMID: 12011872

9: Caton D, Corry MP, Frigoletto FD, Hopkins DP, Lieberman E, Mayberry L, Rooks JP, Rosenfield A, Sakala C, Simkin P, Young D. The nature and management of labor pain: executive summary. Am J Obstet Gynecol. 2002 May;186(5 Suppl Nature):S1-15. Review.
PMID: 12011869

10: Goetzl L, Cohen A, Frigoletto F Jr, Ringer SA, Lang JM, Lieberman E. Maternal epidural use and neonatal sepsis evaluation in afebrile mothers. Pediatrics. 2001 Nov;108(5):1099-102.
PMID: 11694687

11: Robinson JN, Norwitz ER, Cohen AP, Lieberman E. Predictors of episiotomy use at first spontaneous vaginal delivery. Obstet Gynecol. 2000 Aug;96(2):214-8.
PMID: 10908765

12: Lieberman E, Lang JM, Frigoletto F, Cohen A. Epidurals and cesareans: the jury is still out.
Birth. 1999 Sep;26(3):196-8. No abstract available. PMID: 10655821

13: Goldberg AB, Cohen A, Lieberman E. Nulliparas' preferences for epidural analgesia: their effects on actual use in labor. Birth. 1999 Sep;26(3):139-43. PMID: 10655812

14: Lieberman E, Lang J, Richardson DK, Frigoletto FD, Heffner LJ, Cohen A. Intrapartum maternal fever and neonatal outcome. Pediatrics. 2000 Jan;105(1 Pt 1):8-13. PMID: 10617697

15: Lieberman E. No free lunch on labor day. The risks and benefits of epidural analgesia during labor. J Nurse Midwifery. 1999 Jul-Aug;44(4):394-8. Review. PMID: 10466286

16: Robinson JN, Norwitz ER, Cohen AP, McElrath TF, Lieberman ES. Epidural analgesia and third- or fourth-degree lacerations in nulliparas. Obstet Gynecol. 1999 Aug;94(2):259-62.
PMID: 10432139

17: Lieberman E, Cohen A, Frigoletto F, Lang J. Epidural analgesia and cesarean delivery.
JAMA. 1999 Jun 9;281(22):2085; author reply 2086-7. No abstract available.
PMID: 10367812

18: Lieberman E, Cohen A, Lang J, Frigoletto F, Goetzl L. Maternal intrapartum temperature elevation as a risk factor for cesarean delivery and assisted vaginal delivery.
Am J Public Health. 1999 Apr;89(4):506-10. PMID: 10191792

19. Lieberman E, Lang JM, Frigoletto F Jr, Richardson DK, Ringer SA, Cohen A. Epidural analgesia, intrapartum fever, and neonatal sepsis evaluation. Pediatrics. 1997 Mar;99(3):415-9.
PMID: 9041298

20: Lieberman E, Lang JM, Cohen A, D'Agostino R Jr, Datta S, Frigoletto FD Jr. Association of epidural analgesia with cesarean delivery in nulliparas. Obstet Gynecol. 1996 Dec;88(6):993-1000. PMID: 8942841
A small handfull of these are available in free full-text for anyone interested in tracking them down and reading them.

I'm actually nervous to hear back from her!