Tracking:
1. Use a vocalist that can actually sing decently (IOW, don't have me singing your stuff

)
2. Set the "mood" and provide a great atmosphere for the vocalist. This is more important than just about anything else. 95% of a successful vocal take is mental. do NOT underestimate the power of the vibe.
3. Listen to the vocalist sing the song in question. Listen for tone, dynamic range, sibilance, pops, etc.
4. Determine what mics would work for the vocalist and the song/production and have them give each a test. Pick the one that fits the best--note that this is not necessarily the one that sounds best on the vocalist when solo'd.
5. Use a preamp that complements the vocalist, mic and song/production.
6. Provide the vocalist with a monitor mix that works ideally for them. Can't sing if ya can't hear. some vocalists want a LOT of reverb, some none.....some want a LOT of themselves in the cans, some very little, etc.
7. Set the mic preamp for "maximum gain before clipping" and then roll it back a little to provide a little extra headroom.
8. Hit record.
9. Have them sing a "test" pass. Tell them it's a test. Make sure you've hit record anyway. The "test" takes when they think you're not recording are often the best ones. again 95% of a successful vocal take is mental.
10. Be careful when tracking with a compressor/limiter. Once done, it can't be undone. I almost always track with compression--but i know what i want the vocal to sound like and commit that sound to the track.
11. DO NOT screw up the take.
12. I repeat, DO NOT screw up the take.
13. Provide encouragement after each take.
14. DO NOT screw up the additional takes.
Mixing:
1. Don't have the vocalist around when you're comping the final vocal track. A "pitch versus performance discussion" will undoubtedly ensue.
2. Compressors in a series, each doing a little bit of gain reduction can be more effective than one compressor set to nuke.
3. A little distortion on the vocal can sometimes help it sit better.
4. A little delay and reverb can go a long way. Effects are just that--effects.
5. A delay set to the tempo of the song at 1/4 (or 1/8 or 1/16) note intervals can be fun and provide a sense of depth that isn't readily noticible as an echo.
5. Often a multed, hyper-compressed vocal track tucked underneath an uncompressed track can add some girth to the track.
there's more--i could go on all day but won't.
cheers,
wade