Obscure Salesforce object key prefixes

This is a reference to some common and more obscure Salesforce key prefixes that I've encountered.

Key Prefix	Object Type
001	Account
02Z	AccountContactRole
00r	AccountShare
04m	AdditionalNumber
01p	ApexClass
099	ApexComponent
07L	ApexLog
709	ApexTestQueueItem
07M	ApexTestResult
066	ApexPage
01q	ApexTrigger
806	Approval
02i	Asset
01Q	AssignmentRule
707	AsyncApexJob
00P	Attachment
016	BrandTemplate (Letterhead)
01m	BusinessHours
019	BusinessProcess
04v	CallCenter
701	Campaign
00v	CampaignMember
01Y	CampaignMemberStatus
08s	CampaignShare
500	Case
00a	CaseComment or IdeaComment Use caution as there are at least two object types exposed via the partner API with the same keyPrefix!
03j	CaseContactRole
01n	CaseShare
010	CaseSolution
02o	CategoryData
02n	CategoryNode
09a	Community
003	Contact
03s	ContactShare
800	Contract
02a	ContractContactRole
08e	CronTrigger
01Z	Dashboard
01a	DashboardComponent
015	Document
05X	DocumentAttachmentMap
093	EmailServicesAddress
091	EmailServicesFunction
018	EmailStatus
00X	EmailTemplate
00U	Event
020	EventAttendee
022	FiscalYearSettings
00l	Folder
608	ForecastShare
00G	Group
011	GroupMember
0C0	Holiday
087	Idea
00a	IdeaComment or CaseComment Use caution as there are at least two object types exposed via the partner API with the same keyPrefix!
00Q	Lead
01o	LeadShare
0Ya	LoginHistory
01H	MailmergeTemplate
002	Note
006	Opportunity
00J	OpportunityCompetitor
00K	OpportunityContactRole
008	OpportunityHistory
00k	OpportunityLineItem
00o	OpportunityLineItemSchedule Represents information about the quantity, revenue distribution, and delivery dates for a particular OpportunityLineItem. Products, Price Books, and Schedules Overview
00t	OpportunityShare
0D2	OrgWideEmailAddress
00D	Organization
00I	Partner Also OpportunityPartner, which "is automatically created when a Partner object is created for a partner relationship between an account and an opportunity"
00q	OpportunityTeamMember - "This object is available only in organizations that have enabled team selling."
026	Period
01s	Pricebook2
01u	PricebookEntry
04g	ProcessInstance
04h	ProcessInstanceStep
04i	ProcessInstanceWorkitem
01t	Product2
00e	Profile
03g	QueueSobject
012	RecordType
00O	Report
01N	Scontrol
035	SelfServiceUser
501	Solution
081	StaticResource
00T	Task
005	User
100	UserLicense
03u	UserPreference
0D5	UserProfileFeed
00E	UserRole
00p	UserTeamMember
01D	UserAccountTeamMember
083	Vote
00b	WebLink - Custom Button or Link
00B	View
0E8	EntitySubscription
0D5	FeedItem or NewsFeed or UserProfileFeed Use caution as there are at least three object types exposed via the partner API with the same keyPrefix!
058	ContentWorkspace
059	ContentWorkspaceDoc
069	ContentDocument
068	ContentVersion
033	Package - being built in the developer org
04t	Install Package
0A3	Installed Package
092	Weekly Data Export
00S	Import Queue
07E	Sandbox
07M	Apex Test Result
0A2	Change Set
0EP	Inbound Change Set?
00N	Custom Field Definition - Setup > Create > Objects > [Your Object] > [Your Field]
CF00N	Custom Field Id using in the query string. Note the keyprefix isn't actually CF0. In this case "CF" has been appended to the "00N" of the Custom Field Definiton.
0BM	Connection - Salesforce to Salesforce
01r	Visualforce Tab
101	Custom Label
03d	Validation Rule
01Q	Workflow Rule
000	Empty Key
0Q0	Quote
01I	Custom Object
04s	AsyncResult, DeployResult
00h	Page Layout
082	Data from Uninstalled Packages? A zip containing CSVs.
04k	Outbound Message Id
04l	Outbound Notification Id
060	Portal Id
7tf	TraceFlag
0DM	Site
0J0	SetupEntityAccess
888	Remote Access
1dc	MetadataContainer from the Tooling API
1dr	ContainerAsyncRequest from the Tooling API
02c	Sharing Rule
750	Bulk Query Job
751	Bulk Query Batch
752	Bulk Query Result
0PS	Permission set metadata
04Y	Field Update
400	ApexClassMember

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RegEx to validate Salesforce Id

[a-zA-Z0-9]{15,18}