I've compiled the following if anyone is interested in using it.

Code:
// by David Smith @ SWK Technologies
function getRecordIdByTypeid(id){
var types = {
"Account": {
"typeId": -112,
"id": "account",
"category": "List"
},
"Accounting Period": {
"typeId": -105,
"id": "accountingperiod",
"category": "List"
},
"Bin": {
"typeId": -242,
"id": "bin",
"category": "List"
},
"Call": {
"typeId": -22,
"id": "phonecall",
"category": "Activity"
},
"Campaign": {
"typeId": -24,
"id": "campaign",
"category": "Marketing"
},
"Case": {
"typeId": -23,
"id": "supportcase",
"category": "Support"
},
"Class": {
"typeId": -101,
"id": "classification",
"category": "List"
},
"Competitor": {
"typeId": -108,
"id": "competitor",
"category": "Entity"
},
"Contact": {
"typeId": -6,
"id": "contact",
"category": "Entity"
},
"Customer": {
"typeId": -2,
"id": "customer",
"category": "Entity"
},
"Customer Category": {
"typeId": -109,
"id": "customercategory",
"category": "List"
},
"Department": {
"typeId": -102,
"id": "department",
"category": "List"
},
"Email Template": {
"typeId": -120,
"id": "emailtemplate",
"category": "Marketing"
},
"Employee": {
"typeId": -4,
"id": "employee",
"category": "Entity"
},
"Employee Type": {
"typeId": -111
},
"Entity Status": {
"typeId": -104
},
"Event": {
"typeId": -20,
"id": "calendarevent",
"category": "Activity"
},
"Issue": {
"typeId": -26,
"id": "issue",
"category": "Support"
},
"Item": {
"typeId": -10,
"id": "item",
"category": "Item"
},
"Item Type": {
"typeId": -106
},
"Job (Project)": {
"typeId": -7
},
"Location": {
"typeId": -103,
"id": "location",
"category": "List"
},
"Module": {
"typeId": -116
},
"Opportunity": {
"typeId": -31,
"id": "opportunity",
"category": "Transaction"
},
"Partner": {
"typeId": -5,
"id": "partner",
"category": "Entity"
},
"Product": {
"typeId": -115
},
"Product Build": {
"typeId": -114
},
"Product Version": {
"typeId": -113
},
"Project (Job)": {
"typeId": -7,
"id": "job",
"category": "Entity"
},
"Role": {
"typeId": -118,
"id": "role",
"category": "List"
},
"Saved Search": {
"typeId": -119
},
"Subsidiary": {
"typeId": -117,
"id": "subsidiary",
"category": "List"
},
"Task": {
"typeId": -21,
"id": "task",
"category": "Activity"
},
"Transaction": {
"typeId": -30
},
"Transaction Type": {
"typeId": -100
},
"Vendor": {
"typeId": -3,
"id": "vendor",
"category": "Entity"
},
"Vendor Category": {
"typeId": -110,
"id": "vendorcategory",
"category": "List"
}
}
var recId = 'customrecordtype';
for(var type in types){
if(types[type].typeId == parseInt(id)){
recId = types[type].id ? types[type].id : null;
break;
}
}
// if the result is null it's not supported
// default to custom record type if not found here…
log.debug('getRecordIdByTypeid – record type',recId);
return recId;
}