I made some personal searches regarding IE-languages.Some of my preliminary results are:
1.The sumero-tamil language is the main contributor to the forming of IE-languages.It was the most IE-type language of his time.It is containing many basic components later found in IE-languages.
2.The second contributor is proto-akkadian.The sumerian and akkadian areas and languges overlapt.
3.As one must notice,the sanskrite and akkadian-like word roots are the main componets found in IE-languages and the proofs are overhelming.
4.I am suspecting:
-An very early austric infussion in Iberia.
-An early infusion of proto-sumerian in Danube area.
-The very place of final shping of IE-languages was in Mediterranean area.This could not been possible without the contact with afro-semitic and proto-iberian languages.
-The kurgans possible introduced only proto-slavic languages to Europe and not IE-languages proper.
5.The place of origin of latines/letoones is close to Lycia.They entered Europe very early and in Danubian area diverged in some 3 branches.
I am waiting your feed-bac to my notices. ing. Rau Eugen,Romania eugen_rau@hotmail.com