There is no other intervention that has more of an evidence base, and (when carried out under the supervision of a board certified behaviour analyst ) nothing that is more loving, enjoyable and creative.
ABA is the science and application of learning and retaining learnt information more effectively. It has many manifestations, of which home based ABA programmes are only one.
As someone who works in this field I can assure you that all other 'treatments' are at worst damaging, at best ineffective.
Here are some handy references for you.
Also, check out NHS Evdence website and watch this
Eldevik, S., Hastings, R.P., Hughes, J. C., Jahr, E., Eikeseth, S., & Cross, S. (2009). Early behavioural Intervention for children with Intellectual Disability. Journal of Child and Adolescent Psychology 38 (3) 439-450.
Esch, B. Speech Pathology and Applied Behaviour Analysis: Opportunities for collaboration. <a class="break-all" href="http://www.behaviour-consultant.com/slp%20and%20ABA.htm" rel="nofollow" target="_blank">www.behaviour-consultant.com/slp%20and%20ABA.htm</a>
Evidence Based Practice Brief<a class="break-all" href="http://www.speechandlanguage.com/ebp/" rel="nofollow" target="_blank">www.speechandlanguage.com/ebp/</a>
Lord, C., & Corsello, C. (2005). Diagnostic instruments in autistic spectrum disorders. In F. Volmar, R. Paul, A. Klin, & D. Cohen (Eds.), Handbook of autism and pervasive developmental disorders: Vol. 1. Diagnosis, development, neurobiology, and behavior (pp.730-771). Hoboken, NJ: Wiley.
Journal of Applied Behaviour Analysis <a class="break-all" href="http://seab.envmed.rochester.edu/jaba/" rel="nofollow" target="_blank">seab.envmed.rochester.edu/jaba/</a> (accessed on 10/01/10).
Journal of Speech-Language Pathology and ABA <a class="break-all" href="http://behavioralspeech.com//" rel="nofollow" target="_blank">behavioralspeech.com//</a> (accessed on 10/01/10).
RCSLT resource manuals for planning and commissioning services
www.rcslt.org/speech and language therapy/intro/intro (accessed on 10/01/10).
Sackett, D.L., Rosenberg, M. C., Gray, J. A. M., Haynes, R. B., & Richardson, W. S. (1996). Evidence based medicine: what it is and what it isn?t. (Editorial) British Medical Journal, 312, 71-72.
Speech Pathology and Applied Behaviour Special Interest Group behavioralspeech.com
Sundberg, M. (2008). Verbal Behaviour Milestones Assessment and Placement Program: VB-MAPP www.avbpress.com/.
Vargas, J. (2009). Behavior Analysis for Effective Teaching. Boston: Routledge, Taylor & Francis.